Home rebuilt 1920 has poor accel shot

sounds like a lean mixture problem. are you using manifold vacuum for distributor? what happens when you put your hand over the carb at idle (making it richer). Does it mellow out or die? Old carbs...yeah, they work great when new.

Distributor gets vac from carb base port , direct feed.
I'll try the hand over it when I get it back from the alignment shop.

I couldn't kill the engine with the mixture screw turned all the way in with the limiter spring in place ....I could before .

I'll also check for vac leaks when it returns