Originally posted by GTman85
Just think what a cam kit and mani would do to it 
Not as much as you'd think, the heads are the part of the engine holding you back. A cam will help with higher rpm power, but you'll definately lose some low end.
Camed and intake 5.0s are the same way, you can have the biggest and baddest cam and intake in the world, but in the end, your still trying to pull incredible amounts of air/fuel through a straw.