Air:Fuel Help. Cannot Get it Rich

dilweed said

I looked at the product info on mine (Autometer 3379) and it says no "free air calibration necessary", so perhaps I'm good on this. I've got it located at the collector of the header as well. Weird.

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You know I'd like to say I have something to bang mine off to test it? I mean all I can do is really calibrate it and hope that it's working? And of course you drag race so you know watching the plugs is the biggest thing. The two should go hand-in-hand.
I don't like changing a part before I verified that it's the problem. I find this costly.