Need big block help

Here’s a build for a similar street cruiser type application-

-505ci, 9.8cr
-RPM heads with bowls blended and seat work
-original Torker with Holley 850VS
-1 7/8 x 3 headers
-232/237-112, .483/.483 HFT cam

Everything is too small to make big power.
My prediction was 600tq/500hp, knowing it would peak early.