Now there is some crazy bulls eye, been there done that info that should really help.
I like how you posted what it likes with the cam you have in there. (6400 rpms) Would you have head flow numbers?
Rumble when Curtis did my heads they flowed 294 @ .600" on his bench with a 2.02" valve. Ryan Johnson freshened them when I built the 408 and he installed a 2.055" intake valve but they weren't put on a bench afterwards.
