Is the '79 motor ready to go? or will you be swapping parts off of the '78 onto it? If it is complete and you won't be actually opening up the engine, keeping track of all the critical bolts people have been mentioning above shouldn't be a problem as you won't be removing them, and your project should be really simple.
Sascha Steinway TLCA # 20217
1977 FJ40 "Ripper" (because it shreds!) (What is a "shread"...Steve Crase)
1988 FJ62 "Dino" OME, my next project
2000 4 Runner, my daughter's truck, thanks Dan!
2013 F-150 "Black Ops"