[cadillac_al]

I really doubt that the 4.9 is stout enough to support much more power; especially at higher rpms. GM always uses small cams so I think a moderate cam would be the biggest bang for the buck. The small turbo theory sounds like a good plan too but if it's going in another vehicle you might as well put money in a Chevy V8. How heavy was Pete's 12 sec car?