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I run an autolite AR23 (8.0to1 buick 231 on 30lbs) If you prefer AC Delco it'd be a CR42TS, NGK makes a great plug, but I don't not know the interchange right off the top of my head. As far as making power goes, low compression high boost it the way to go, but for crawling having a little more CR and bottom end torque would definitely be helpful. I also wouldn't run anymore than a .022-.025 gap
