I ran the H0-3 cam with similar specs in a 462 with about 11:1 compression and a similar setup to yours and it ran pretty good. I think the cam is WAY TOO BIG unless you go to 4.56 gears and/or a bigger convertor. A 750cfm should be plenty for those cubes/rpm. What is your compression?
PHILLYGOAT
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PHILLYGOAT
1965 GTO/ OEM Block, Crank & D-ports(all slightly modified of course)/
3550lbs/ Full Exhaust/ Foot Braking
1.41 60ft [email protected] [email protected](Pontiac Heaven) 
More Details on GOAT http://www.pontiaczone.com/forum/vbpicgallery.php?do=view&g=379
GTO Burnout http://www.youtube.com/watch?v=nZqdcH0Ltc4
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