I'm right in the middle of that process now. I have an 84 4Runner that I'm swapping in all the EFI stuff from an 85 4Runner. So far I've swapped, fuel tanks, fuel lines, complete engine and dash wiring harnesses, and am using a rebuilt block and all the EFI components.

http://www.rockfrogs.org/phpBB2/viewtopic.php?t=110&start=0

It's alot of work and I'm still not done <img src="/forums/images/graemlins/zombie.gif" alt="" />