RPM Airgap vs. non-Airgap?

Here's the combo as is right now. 340 0.30 over, 10.1:1 pistons, comp cam 292, .501 lift, 244 duration, ported and polished J heads, M1 intake, 750 holley 3310, FBO ignition, 5-speed Keisler, 8 3/4 3.91 gears Detroit truetrac diff. Stock 5x4 axles. Wheels don't know yet. Currently have SWS 15 x 5.5. Will try to get a 15 x 7 drag radials for the strip

Test will be against the RPM and Mighty Demon 650 and FBO ignition

What parameters should be included in the test? e.t., 60ft, idle characteristics, Shifting characteristics, mpg, detonation issues, etc

This should be a fun test I think. I need the tuning practice