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Anyone ever actually flow test a 1406 to see how much air is moving through it?

I have a Holley 3310 with a Pro-Form main body. Im asking in general how to do this but also because Im working on my app specifically. Im using my LM1 to tune. When I floor it from 3k in drive its about 12.2-12.4 AFR down low and leans to about 12.8 at peak RPM. I need to play with the...