Hey guys I'm kinda new here but I'm really stuck on this, it keeps backfiring threw the carb and exhaust. Here's some back info on it. I have a 64 f100 with a 292 with 20 thousand miles on it found it in a feild been there since 87. It is completely stock I've been fixing it up it was leaking oil out of the valves like hell so I pulled the heads and had positive stop valve seals installed and hardened valve seats for the exhaust.
Did a new distributor and oil pump because someone had put the oil pump driveshaft in upside down and tack welded it to the distributor never seen anything like that before. Has a new coil, plugs, plug wires, points, cap and rotor. I rebuilt the carb.

So before the heads sometimes it felt like the distributor wasn't advancing and it would bog out. Now after the heads and everything it ran pretty good I drove it 50 miles that night to Reno to help my brother with a duece he bought. Then the next day it started right up drove it another 50 miles then parked it over night again. Then that night it never started again found the points had closed up so fixed that try to drive it around the block and it just kept backfiring threw the carb.

Alright so I compression checked it to make sure it wasn't the valves I got 120 on all cylinders cold and it didn't leak down any. Ran the overhead again the valve lash. It was advanced 10 degrees so I reset it to tdc and then it would hardly run just kept backfiring out the exhaust. So I advanced it again about 5 or 7 degrees now it only runs with the throttle half way open and takes turns backfiring threw the carb and exhaust. I'm getting no vacuum reading on the dwell meter and the plugs look fouled like it's running really rich.

Do you guys think it's the carb or the timing because I'm lost I use to be a car mechanic I'd do heads and transmissions everyday but I've never done anything this old.