Good Morning, Nick,
I would like a few more details, such as is the problem when you first start it up cold in the morning? If so, it might be a choke problem. If it idles for a long period on a hot day and then dies, it might be a vaporlock problem. It might also be something as simple as float level or dirt in the fuel system accumulating on the needle and causing a "slow-onset" flooding condition.
The latter would be characterized by a cloud of black smoke on restart and rough running until the spark plugs ran clean.
>From what you've said, I'd put in a clean filter (If possible) and check the float level and needle/seat area.
Here is another fact to muddle your thoughts: During that time frame we had LOTS of problems with dirt in the systems. The symptoms were as you mentioned. The cure was to go from all-brass needle/seats to a needle with a viton ruber tip. The rubber tip needles were much more forgiving as to sealing round small dirt particles. I've not seen any all-brass needles in years, but who knows?
I note that others on the list have suggested valve problems. It might be so, but frankly I wouldn't go there just yet, except for research...
Good Luck!!!!! Let us know what you find.
Joe Savard
Test Driver/Mechanic
Chrysler Corp. Carburetor Lab, 1953-1961
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