Start with holes in the manifold bein' the problem. Read "massive amounts of unfueled air." Those 123s don't take much choke to start, and won't run well for long with any choke at all, no matter how cold.
If you've got her to run with choke, she's gettin' too much air somewhere. You need to have a good manifold with no leaks. It needs to be mounted to the head with good gaskets torqued down. You need a good gasket between the top of the carb and the neck of the manifold. I don't like bringin' it up, 'cause it's costly to fix, but might you have a crack in the head? If all the easy things are in order, it might pay to have the head magnafluxed, but I'd think a leak that bad would be obvious to the eye.
If your carb is good to go, these are the only places (apart from the head gasket, but then you'd be havin' other, more serious problems) that you could be leakin' vacuum.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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