Well my Nova came with the Chevy 250ci stock (which is what's in it right now) and I was hoping to get HP in the 300's with it. But I figured if we're gunna build a mean six, get either the 292 or the 4200 because of increased displacement and technology/efficiency upgrades. I'm ok with throwing the checkbook at it (Marine Corps pays me twice a month! lol) so that's not so much the issue here. I'm basically looking to make as much TQ and HP as possible to be run on mostly 91 Octane for the street.