How to get 400 hp out of 1971 340 .30 over

I’m right at 400 out of my 340 .030 over with lightly ported 2.02 J heads, 10.2-1, air gap, a similar cam, Comp magnum roller rockers, tti headers, 750 Holley DP. It’s not hard, no crazy parts necessary.

New engine builder ☑️