Which one is nicer to begin with? I'm meaning cylinder bores, cam journals, and main journals, straight decks, no rust etc? I've heard that a 2 bolt block with an aftermarket splayed 4 bolt main cap is stronger than a regular 4 bolt block. I've also ran more power through a 2 bolt block than some of the 4 bolt blocks I had. (Not that, that is a deciding factor) Those were early 010 blocks though. If one needs no machine work and one does, the one needing less money put into it may be the way to go. But in my mind the 4 bolt is cheap insurance. I guess I'm not much help.