Not Ranked
Having a 750 instead of a 650 will have only this effect: slight loss of throttle response at lower RPM's and less chance of a few lost HP at the top of the RPM's. Stumbling, idle quality, etc will not be affected.
WB: how far turned out are your idle screws?
Is it possible you have a blown (or incorrect) power valve?
Under what conditions did your motor run awful after putting in 68's?
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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