Ray, the engine looks great in yellow! Looking back in time, and relying too much on memories (dangerous, believe me...) I think that you bought the ProFiler heads to take advantage of the flow at higher rpm's, and you're wanting to push your power band out more into the 5500 to 6000rpm range, while maintaining it's manners in the normal cruise range as much as possible. I seem to recall some stories of an "Old guy in a hot rod" hanging with the kids in their Camaro's and Mustang's up to the century mark, but then they pull away slowly? Do I have it anywhere close to right, or has my CRS struck again?