340 on pump gas

I have a 1970 340 with T/A heads with the "bumps removed" from the ports. TRW pistons with some machine work to get to 9.25 compression - objective was pump gas operation. Bigger cam was custom ordered by Gene Pearson of performance automotive in Forest lake MN, who assembled the engine for me on this conversion. dyno tested at 396 HP at 6200 RPM, losing a few HP per 100 RPM after that, shut it off at 6500, for what it is worth.