For allmotor you're always gonna want that extra bore and stroke from the LS bottom end!! Believe me when I say I'm a GSR man myself but the B16 is gonna be real hard to pull any real torque numbers out of it allmotor. Hell they're even hard to pull decent torque numbers out of boosted.

You'll have a car w/ good hp and torque if you build a good LS/VTEC. You'll never be able to pull anywhere close to the same amount of torque out of your B16 if you do the same build on the LS block.

You could always use a stroker kit for the B16 block but that's a serious waste of money if you can already get your hands on a LS block in good condition.