Upgraded 502 mag from iron heads to aluminums, new heads call for a .750 reach gasket seat style plug, can anyone recomend a decent plug that should be able to get at most parts stores?

Specs on engine are .030 over, 9.8:1 compression, eddie emi manifolds, promaxx 317 heads, 237/245 hyd roller cam, strip dominator intake, 850 qft marine carb.

Take a look at the NGK-R5671-7 4091..........use anti seize on aluminum heads...many auto parts stores carry them

I use the Autolite AR3933 in my AFR heads. I buy them at any auto parts store. I like the shorted electrode to expose the spark and reduce detonation. I run 10.1:1 compression with the Daytona Sensors ignition. I can idle for an hour or more with no plug fouling. I have a pretty big cam and custom 1000cfm 4150 series carb.

Quick note, the two spark plugs recommended above are non resistor. Just noting it in case it matters to you.