Re: Chevy 350?\'s
I totally agree with Dave. There will most likly be other issues too related to sensors on the block....or rather the lack of holes to put them in.
I picked up a 5.7L TBI with tranny, computer and harness out of a 94 Chevy PU for $500. You could spend a lot more than that trying to make an older block work. Besides, your going to want the Heads, harness, computer, etc....most likely they will be attached to the block...might as well take the block.
And for the record...4 bolt mains are highly over rated for what we want to do. Unless your pushing 400 horses or more...there are plenty of other things to break before the crank does.