Its quite difficult to dial in cruise A/fs with a carb, if you start changing main jets you will effect wide open throttle A/f. I tried with an lm1 and data logged but it was tough, problem is the same circuits in the carb feed a wide range of loads. Your engine dyno A/fs look a bit on the lean side, becareful leaning it down more on the primary main jet, especially since you changed the heads. Wide open throttle ussualy see's the A/fs in the 12.7 to 13.2 range. Id throw more fuel at that motor, Id bet it would make more power.
Keep an eye on your header tubes, if they start glowing a bit of red your to lean, I had a smallblock that at idle was so sensitive to the four corner idle adjustments when adjustining it above 13.8 the tubes would just start to glow, pissed me off since it spotted the jet hot coating.
Rich
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