At wits end!

Hello all

I've got a 72 318, when I got the car it would run ok but never great but I figured it would be an easy fix. It will start up fine, hit the key it will fire. If you slowly push in the accelerator she will go just fine. If you try to push the pedal in fast or goose it she will die. Same thing happens when coming around a turn and you try go.

I've changed the fuel filter, checked the points, check the plugs, changed plug wires, rebuilt the carb and went through for vacuum leaks. Today I was going to try and advance the distributor but as I started the engine and let it run a bit smoke started coming off/under the exhaust manifolds. I'm pretty confused now, hopefully someone has some insight.

Stock 318, carter 2 barrel carb.

Thanks