Would I lose in low end torque with these heads, espically if I put in the bigger valves. Your saying in the higher RPMS it would help cause now it seems it doesn't like to keep pulling above 5000 RPM. So thats about where I shift. With the 781's it should keep pulling into higher RPM right.

I also might just use these heads in a later build of a 468. How much money would I have to stick into these heads to get them to perform for around 500 horse power. Maybe with 10:1 compression. Not a very big cam though I have to have good vacuum for the rules. 15 inches of vacuum at 800 rpm to be exact. Is it possible to reach the 500 mark. Thanks