A 50 horsepower gain would take some better intake setup and at least 245 degrees of duration, I.E. a big jump in cam size and 10-12 inches of idle vacuum. CNC ported heads will probably net you half of that if you prefer to not give up any street manners. I would agree that I don't think you will find 50 usable horsepower out of any cam without other changes.
Do you want more horsepower or do you want the car to go faster? As the others said there is probably alot in your tune up.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
