nsadhal, just an observation, but you're approaching this project with a Honda attitude (btw, you guys are so spoiled with your lego-like swapability, haha.)
You're gonna have to do a bit of research on the way an SBC or Ford are put together, its not quite the same as saying "a B18C5 makes 195HP and costs $3500 and a B16A1 makes 160HP and costs $1500, which is better?" An SBC for example could make anywhere from 140HP to 1200+, it depends on how its built, and I don't mean somthing as simple as whether or not he has Skunk2 cams and bolt ons, but truely hardcore shit, like matching carbs/intakes/cams/headwork/etc. For that reason, I'd say go with an LT1, they've come in Camaros/Firebirds since 93 and I think in 'Vettes since 92, the T56 6-speed is a nice and stout tranny if you upgrade a few little parts and they're good on gas if you don't wring them out on every shift. If you shop around, you can pick one up pretty cheap too. If you don't like 265+ stock HP and gobs of torque, there is a huge aftermarket.
Good luck dude.