Custom ground camshaft, low power

What type carb?
What size carb?

You definitely should be making over 365 horse at the crank. That's small block horsepower. lol

This one;

http://www.holley.com/0-80870

holley 870 4bbl vacuum secondary. Model 80870.
I had a 750 holley on but was running lean at top end on the dyno.