When I was in highschool a friend and I put a huge cam in a 283. it was like 500 lift and 290 duration. The thing was totaly stock otherwise. What a dog. We thought that we were cool. Turns out it went better with stock cam. It would not even idle below 1100 rpm's. Also had a stock power glide tranny with stock converter. What a chore to drive that thing. One thing I will say is that it would bounce the needle off bottom of a 8000 rpm tach.