Tuning a Proform/Holley carb, what parts and tools?

yellow rose said

If you think you have the fuel control issue solved, buy a new set of plugs and start with those so it makes seeing what's going on easier.

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Just got home from work and pulled the #1 plug. Haven't driven it since yesterday.

Gonna go make a run without the gas cap to see if maybe the tank is not venting enough.
I should have a new set of FR5's waitng at the parts store. The one pictured is an FR4, what do you think YR, should I go down one heat range or wait and buy FR4's again. (have to order)