advice

What size rear tires?

Likely WAY too tall gears, 323 might not help much

Where is cam degreed? Makes a HUGE difference

Is distributor recurved? stock? late model smogger?

14 BTC might not be enough. Search some of crackedback's posts on adjusting timing.

and..................converter..............

My "budget" backyard build was "run what ya had."

I had a used 360 out of a van with a GREAT big converter about 1800?? stall with a smaller cam than you. It was no stormer out of the chute, with 370 rear gear,