[Tommy]

Gary,
I wrote this before your last post. Take it for what its worth.

This is information, not a diagnosis. ... I run my 410 Windsor with carburetor (no choke) and fairly cool plugs. I have to pump it a lot on cold starts to keep it running until it warms up a bit. When the plugs get several thousand miles on them, I start noticing a miss at lower RPM until it gets good and hot. When the miss persists long enough to be annoying, I change the plugs and everything is OK for a while.

My advice is to remove the air cleaner, manually adjust the idle screw a little higher (so you have time to get out of the car and observe the carburetor without the engine dying), and see what the choke plate is doing. Don't get too close (backfires are bad). My guess is that the choke is not closing enough and that is why pumping the gas helps. If the choke is working ok, I'd suspect the plugs.