another point to make here. If you do want to sell it, and don't want to work on it that can be done, too. Having a running FJ40 as nice as yours looks will fetch way more than the $1,200ish it would take for someone else to fix it. If you have enough to cover the cost of having someone else do it and then sell it, you'll be way ahead. Two examples out of my life recently:
- I had an a 4runner that had a blown head gasket. We had it fixed for $1,000 and sold it for thousands more than we could have, had we left it inoperable. probably came out of $2,000 - $2,500 better because we fixed it before selling, and I felt much better selling it with the quality recent work that was done.
- I recently had two burnt valves on my 60's 2F. I should have listened to MUD and pulled the head myself and sent it out. I didn't. It cost way too much for a mechanic to do a less than satisfactory job and I ended up going back into it and fixing all kinds of other stuffy myself. I've sworn off mechanics from here on out, learned a ton about the truck and myself and now have a fine running 60 that is an absolute blast to drive.
If you have some mechanically inclination, and it sounds like you do, you absolutely can change out a head gasket yourself.