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You have lost velocity of the intake air charge. That plus the single plane replacing a dual plane intake means you lost vacuum signal at the carb. You may get satisfactory results by adding more fuel to the accell pump shot, or maybe even running a smaller squirter to lengthen the pump shot duration.
I am assuming that when you say it stumbles at part throttle, you really mean it stumbles as you transition from part throttle to slightly more throttle, but not at WOT.
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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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