Now here is the latest I have got the timing set at 12* & have changed the manifold to the Edlebrock Performer dual plan still have the 600 holley as I haven't been able to get a 750 yet.
I have fitted 72 jets to the 600 which has seemed to help alot it runs great up to about 4400rpm then the accleration flattens out. It feels like it has alot more to give so when I get a 750 what jet & power valve sizes do you recommend will work well also will I need to change the vacum spring diaphram ???
Thanks again for all your help guy's this has been a fun learning curve.