Backfire through carb on acceleration

[47topless]

I am new to Model A's. My new car, 1931 Vickie. I had really bad backfire through carb. I bought and installed a new distributor, cap, body, plugs etc. and a rebuilt carb. I am "fairly" confident that I timed the engine correctly. Engine still has a backfire through carb on acceleration.
As a check, I installed a new coil but left the old one installed on the firewall. Engine starts really well but still has some backfire through carb.
A crazy thing I noticed was, what appeared to be oil, dripping down out of the old coil from the coil wire contact point.
Any suggestions on solving this backfire would be greatly appreciated.
Thank you,
Phil