You have nice set up but my main concern on this would be the heads. I think That with anything above 355 CI, and with the parts and compression you have, I would have gone to a bigger runner head. Something like a 200cc head, or at least 190cc. With that smaller runner this engine will be a torque motor for sure. But at the track will struggle at the top end. Big cubic inch small block need more air in to breathe and perform well.
Also, try a Holley 750, with vacuum secondaries.