Yes. Pretty sure I used to use the Champion RN12YC plugs, then switched to Autolite 65's, then started using the NGK's as they seemed a bit easier to read, plus a lot of guys liked them. They all seemed to work, engine ran just fine. I tend to change them fairly often. Edelbrock 750 always seemed on the lean side for this motor, no matter what I did to it. That combined with the MSD kept them clean and looking good. My learning to actually read the plugs is a more recent thing for me.
As far as timing goes, I always hear the color change should be right at the bend of the electrode, I'll back it down just a bit from where it is now.
