24v to the coil.

I had a problem with similar symptoms. After fighting with the fuel system (I could keep it running for a while by pouring gas down the throat of the carb so I was convinced it was fuel), an older guy I know told me to change the condenser. I had put a new one on when I rebuilt the distributor not long before, and already checked for spark, but I was at the end of my rope and gave it a shot. It fired right up and ran perfect with what was probably the original 40 year old condenser. Hope you figure it out.