Holley/Demon Carb stumble

My gut is to try slowing the advance so timing from 2800 might be 30 - 32 and 38* is above stall.

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I’d actually go the other way.
I’d lock out the distributor.

I do agree with trying the small carb at the track to see how the car behaves with it on there, with the new converter and tires.
But that could be a couple of runs, then swap it out at the track type deal if it worked “as advertised”.

Still wondering why the decision was made to go with the tighter converter and taller tires.