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I used a 78 cop motor with a 509 MP cam and got [Email]12.88@108[/Email] with a stock TQ intake and a 750 Holley Spreadbore double pumper.
On thing that you may have to do is trim the tops of the valve guides down I had retainer to guide issues with a 509 and 452 heads.
I was only running a 3.23 gear and the car weighed 3700#
Gus




Is the triming of the valve guides what Comp Cams means if they write: "Requires machining on cylinder heads" ???