1994 GMC Pickup engine swap - advice please

[Psycho Billy]

I am planning on swapping out the 350 in my 1994 GMC pickup with another 350 I'm farming out of a 1989 Suburban. I was going to build the engine on the side and swap them out one-for-one to save downtime on my pickup (it's my daily driver). I haven't pulled the suburban engine yet, I want to do a compression test first. What kind of PSI values should I be looking for? Also, are both these engines 4-bolt mains or 2-bolt? The direct crate replacement engines are 2-bolt.

One last question; I was considering running it carbureted, is there anything special I have to do to accommodate the emmissions system or the computer? I've heard I also need a "return-style" fuel regulator, is this also true?

I appreciate any advice you can give me.

Thanks!