From what I remember the 600H.O.'s should be around 8000 rpms and the 800's around 7800. My 600 H.O. loike to see 8100-8150 on the tach. Remember Doo tach's are out 100-200 rpms. So 8100-8200 on the tach would put you around 8000 at the motor. As for pin weight with a 22 tooth top gear I would just change the gear and see what it pulls for rpm's first.
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