It's possible one of the problems is the new condenser. A lot of folks report them being bad right out of the box. I believe NAPA still sells a decent one.
What spark plugs did you use? Did you check the gaps on them and adjust accordingly?
Did you also trace the spark plug wires to ensure they are correctly routed from the correct cap location to the correct cylinder?
It didn't say if you replaced the wires. If not, try to find a dark location and look at them with the car running. It could be possible that one has rubbed through and is shorting out while running. The dark location will show the short with a flash.
This is the carb you have, correct?
https://nationalcarburetors.com/NEW-...72_p_2500.html