Sub died in middle of the road this morning

[65chevysub]

Just had my carb rebuilt and new filter installed and was running fine for 3 days. Started out this morning and it died, so I pushed it while wife steered. Pulled the filter and pump is working fine. I have the Ignitor kit in distributor so no points/condensor. Cranks fine. Called the guy who worked on it and he towed it to his shop but thought I would see what members here think might be wrong. I'm leaning toward something stuck in carb that got through. I ran straight line to carb and still no start.
What do you all think it could be?
283, 4 bbl Carter. No problems until now except running rich and hesitation.
Thanks in advance