Is the cooling system functioning well? It will aggravate your cold stumble, but lowering the thermostat to a 160 might help with the dieseling issue.
I re-read the previous posts and you mentioned at one point it was running well enough to move the car from the yard to the garage. How old is the gas in the tank? Bad, stale gas would definitely cause a stumble and dieseling too.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (195-1bbl, 3-speed transaxle. 428 RAIV, 5-speed, IRS planned) Pictures
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