New motor backfiring through carb

Nope. It doesn’t matter. I screwed up somewhere along the line so I’m starting from scratch tomorrow. My best guess is that when I pulled the distributor out to prime the pump that the shaft spun. I made sure the gears were on what I thought was the correct tooth but if it had spun at that point then I was off. Who knows but I’ll have it taken care of tomorrow hopefully.
yup, get some sleep and go fresh. if you have a service manual it will have the "how to" for setting TDC and lining up the distributor slot