What would be a good choice for a spark plug. 360 12.8-1 comp, j heads 2.02 intake, VP110 fuel MP.509 Cam. strictly strip

autolite 3933 race plug

with J heads...AR-51 Autolites

NGK R #9

Or a Champion C59Y or YC, or 61 (warmer). Y has the finer tip, both 5/8" hex, projected tip.

NGK 5671-9 for a 13/16" socket
NGK 5671A-9 for a 5/8" socket

All the plugs that are posted here are exactly the same heat range, so you have a couple of choices to make 5/8" or 13/16", standard or extended tip, and what brand you like. As I posted AR3933 is 5/8" standard tip and AR3910 are the same heat range but with an extended tip. I have ran them both and both work fine, the AR51 has a 13/16" socket size and the AR3933 and AR3910 use a 5/8" socket I like the 5/8" because it's smaller and sometimes you might need a little more room around the headers

I could defintly use a bit moreroom around the headers thanks for the many suggestions

I currently have champion RN11YC4 in my engine and I would like to.
Go a few heat ranges lower.
stay with a 5/8 plug.
Be able to get them over a parts counter like advance or auto zone. I really liked NGK'S in the past.