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Based on what I'm getting from you guys, I'm first going to bump the timing to 38-degrees and get the AFR right. Do you think I would get anything from retarding the cam?

It sounds like I'm not going to make a lot more power without a change in heads or cam.

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Timing needs vary by head material design and chamber shape. My 906`s made 615 hp 580 tq on engine dyno and went 10.40`s at 3200 lbs. Tighten the plug gap to around .035 and see what happens. Bigger cam would help as stated along w/a better intake if you can swing it..........good luck.