I run low boost 10-11psi on my 8:1 455 solid roller street TA. I love frying the 335 Kumhos at 60mph! Have your cake and eat it too! Torque is king for a street car. On a dynojet, I made 500+rwhp and 600tq with only 7lbs at pig rich! I havent been back since making carb changes, which reminds me...

Carb tuning can be a pain. but there are companies now that are fuel injecting our ponchos. But then you've got to learn to program FI:(

There are a bunch of us over at Pontiac Zone. Don't go there if you're serious about the 4.8 idea, cuz these guys will change your mind.