Agree with everyone above. The heads aren't there and the cam is going to give you fits. It'll be a turd, likely ping and run hot.
I have a similar engine to what you are trying to achieve.
+0.030 455
Speed Pro pistons, factory conditioned rods, N crank
as Cast Kauffman D ports, torker ii intake manifold
232/238 112+4 roller
3 tube headers
It runs 104.5 mph through the quarter in 8500 ft air at 3630 race weight. Corrected for sea level, the engine should be in the low 500hp range and probably 570 ft lbs. If you're after a good driving mid 500hp engine, I'd step up to a larger cam and you'll need a decently set of ported stock heads, or go aftermarket.
a set of SD prepped 290cfm Kauffman D ports with their Old Faithful cam and a properly matched intake will likely get you there.
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-Jason
1969 Pontiac Firebird
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