i need help on choosing a set of after market heads i have a 350 30 over flat tops extreme energy cam 477 480 lift 224 231 duration at 50 air gap intake holly 650 double pump carb i currently have a set of 462 on it now but no assy holes what kind of horse power would you think this combo would make  

That combo will make good power, but without the accessory bolt holes, you have issues with bolting on anything outside of an alternator.

I'd look at a set of budget aluminum cylinder heads from someone like RHS. You can get a pair of equipped aluminum small block heads for about $600, or less if you hunt around. Lighter weight and superior flow numbers to the old Hi-Po iron heads.