I know this has been covered before but i cant find the old post. Trying to figure out which plug i should be using. 446 with TRW 2355's and Indy Ez's head with 10.8 comp. MSD-6 ign system. My local parts guy can get me autolites and champions for me but not NGK (dont know why). Anyway i thaught some of you guys may know. I do have a set of Autolite AR3934's i got from a guy for 7 bucks (new). If im not mistaken thats a 4 heat range. Isnt that too cold for my comp?

I use Champion RC9YC or Autolite 3911 in a similar motor with Eddy RPM heads.