I just finnished up my valve cover gasket and though I'd share my experience for those who will be doing theirs. Overall, it was really easy. The most difficult part was getting the spark plug seals out and back in.
I had pretty bad oil leakage which was from the seals being dyed out and most rear bolts on the valve cover being loose.

Lots of oil in the spark plug tubes.

I had the valve cover cleaned at a machine shop.

Results of prying out the spark plug seals.

I carefully cleaned the surface of the head before putting the clean valve cover back on.

I was happy to see the tabs make the gasket fit tight. No issues with it falling out while reinstalling the valve cover.

I soaked the spark plug seals in penetrating oil - then slowly preyed them out. They are brittle and it takes time! Getting the new ones in was challenging too. I ended up putting a little oil on them and found this part from my fishing pole that was the same size. Hands on each end of the board and used body weight and a slight rocking motion to press them in.

I only removed one of the by-pass hoses on the throttle body. I replaced it since it was not going to be a snug fit after being removed. If you don't replace this hose you may end up with a slow coolant leak. You can get by with bulk hose here. I went with the OEM hose.

My whole reason for this post is because I had such a hard time finding information about this. The FSM does not even go into this. Which is probably because its so simple. You do not need to torque these bolts. They only need to be firmly secured. I used nut driver then did just a bit more with a ratchet. These bolts are all easily accessible so you can check them when ever you want. The same with the throttle body bolts.

Replaced the hoses since the old ones were so dry.

I also replaced all of the spark plugs, wires, cap and rotor. I'm really impressed with the snap connectors on the wires. These are the most secure I've ever seen. Also, the cap and wires are all labeled to which cylinder they go to.

Here are the parts that I replaced and their OEM part number. Remember you need 6 spark plugs gasket seals. I ordered 1 thinking it was a set.
16264-66021 by-pass hose
12204-35040 PCV valve
90480-18001 PCV grommet
11193-15010 spark plug gasket
11213-66021 valve cover gasket
22271-66010 throttle body gasket
12262-66021 PCV hose
12261-66021 PCV hose
19102-61240 distributor rotor
19101-66010 distributor cap
90919-21557 spark plug wires
90919-01176 spark plug
This was my first time getting to really dig into a Land Cruiser. I really can't wait to start the next project! Such an easy truck to work on.
I had pretty bad oil leakage which was from the seals being dyed out and most rear bolts on the valve cover being loose.

Lots of oil in the spark plug tubes.

I had the valve cover cleaned at a machine shop.

Results of prying out the spark plug seals.

I carefully cleaned the surface of the head before putting the clean valve cover back on.

I was happy to see the tabs make the gasket fit tight. No issues with it falling out while reinstalling the valve cover.

I soaked the spark plug seals in penetrating oil - then slowly preyed them out. They are brittle and it takes time! Getting the new ones in was challenging too. I ended up putting a little oil on them and found this part from my fishing pole that was the same size. Hands on each end of the board and used body weight and a slight rocking motion to press them in.

I only removed one of the by-pass hoses on the throttle body. I replaced it since it was not going to be a snug fit after being removed. If you don't replace this hose you may end up with a slow coolant leak. You can get by with bulk hose here. I went with the OEM hose.

My whole reason for this post is because I had such a hard time finding information about this. The FSM does not even go into this. Which is probably because its so simple. You do not need to torque these bolts. They only need to be firmly secured. I used nut driver then did just a bit more with a ratchet. These bolts are all easily accessible so you can check them when ever you want. The same with the throttle body bolts.

Replaced the hoses since the old ones were so dry.

I also replaced all of the spark plugs, wires, cap and rotor. I'm really impressed with the snap connectors on the wires. These are the most secure I've ever seen. Also, the cap and wires are all labeled to which cylinder they go to.

Here are the parts that I replaced and their OEM part number. Remember you need 6 spark plugs gasket seals. I ordered 1 thinking it was a set.
16264-66021 by-pass hose
12204-35040 PCV valve
90480-18001 PCV grommet
11193-15010 spark plug gasket
11213-66021 valve cover gasket
22271-66010 throttle body gasket
12262-66021 PCV hose
12261-66021 PCV hose
19102-61240 distributor rotor
19101-66010 distributor cap
90919-21557 spark plug wires
90919-01176 spark plug
This was my first time getting to really dig into a Land Cruiser. I really can't wait to start the next project! Such an easy truck to work on.