A good porter can get you 310-325cfm with the RA4 gasket size which isn't too big.
Personally i'd have the same porter match a RPM intake to the heads along with plenum work.
Then I'd get a cam that's mid to high 230 duration on the intake at .050 and with as much lift at the valve as possible (you can't go wrong with big lift).
These things should give you a great engine that still runs well with 3500stall converter.
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