I ran a 75shot(forced pistons), ZEX plugs, stock timing and of course 93 octane. 75shot would make that engine go boom without tuning. But a lot of d-series people in my area are on the bottle with 75shot's. I've seen 2 of them blow their motors up, some running fine. Depends on how your set up, I'd go with a 50shot if I were you.