I'll second passing on TLC for now...no disrespect indented...and I would also start with Mark. Mark knows and loves these old 40s as old 40s, and if you appreciate the old stock, and show signs of being a future purist, then Mark can help you make the changes to make your rig safe, and to bring it back closer to 1964 stock at the same time. His handle on mud is 65swb45, and you can see some of his work on another '64, also recently acquired by someone in your neck of the woods;
https://forum.ih8mud.com/40-55-series-tech/470325-help-1964-fj40-southern-cal-2.html
Like I mentioned before, most of the changes that were done on your '64, are bolt on of newer parts, and if you take your time, you can find a correct windshield, doors, top, seats, original F135 engine...etc, and make the quick switch...you are lucky to be in CA, as it is all at your finger tips, as you have some great guys local to you who can really help you with parts, and working on your rig (Rob and Pardi quickly come to mind)...I on the other hand, needs to get everything shipped, and that is not cheap
Edit: The biggest "work" will be filling the holes made for those tail lights...you can get new OEM tail lights and brackets, so I would make that change when you get the brakes and steering checked and done...and get new bumperettes for the back at the same time while you're at it.
You might also want to drop in, in the FJ25 section...it seems that a lot of early FJ40 purists (mainly 1965 and older) have started build threads there, and you might get really inspired...with lots of great reading and pics;
FJ25 Owners Group
...OK, that is my 0.02 worth, and I'll get off my soap box as everyone has their own opinions, but once again, great looking rig
