swapping a 302 into a 4cly

how hard is it to bolt a 302 into my 89 YJ 4cly do they bolt up easy. I see a lot of them and what else will bolt up.:banghead: :1zhelp:

not sure if this is exactly what you are looking for, but it might help some,
http://www.pirate4x4.com/forum/showthread.php?t=45309

I know it's very common to swap a chevy 350 and trans in, they have kits for it.