from the choices above, definetely go LSx. you can go anywhere from a stock 350hpLS1 to a 620hp LSX454 crate up to 2500hp+ built engine with forced induction/nitrous. there are reports of the 4th gen camaros getting 28mpg on hwy with ls1/t56 combo, very respectable IMO.
i would go LSx under any circumstances unless you were either building a drag-only car or a show-only car, then it'd be a forced induction (of some sort) BBC. but for driveability purposes, LSx all the way.
for HP to displacement numbers with equal driveability, NOTHING beats the LSx.
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