I will look into it. On Saturday my father in law is coming over with a timing gun and done knowledge. He will help me with that.Have you had a chance to check the ignition timing.
Shoot for around 14° BTDC @ idle (vacuum advance disconnected).
If your engine is still backfiring thru the carb after the correct timing has been set, I recommend you purchase a spark plug piston stop and confirm TDC with the timing marks on the harmonic balancer and the timing tab lining up. There are a lot of articles and youtube videos on how to find TDC with a piston stop. We are also here to assist with advice as needed.
You should also do a compression check of all of the cylinders. Look for any cylinders with low/incosistant pressure. You may find some of your valves are out of adjustment... or even worse, the cam my have "wiped" a couple lobes.
As for compression test I can do that. What does it mean if the cam wiped a couple lobes?