stock 1973 318 V8 starts but won't idle without foot on pedal

Even after it is warmed up it will die if I take my foot off the pedal. I'm doing a lot of work on this Dart to sort it out after a 25 year storage. New spark plug wires got it running but a a trip to my modern car mechanic did not solve the startup issue. They timed it and adjusted the choke. My diagnostic skills under the hood are not good. What steps can I take to identify the problem and make this car run smoothly?
I have done some significant repairs to the front suspension and transmission with help from this forum!
I would buy a carb rebuild kit...
But first.. spray some wd40 all around the sides of the carb to manifold gasket as well as the base to body gasket of the carburetor. Let it sit a little while..
Come back and spray the base one more time... dont make puddles but get them soaked. Any puddles just soak them with a rag. Fire it up and see if it idles now...even if only moments longer before dying. It'll show you the vac leaks at the base and carb body, verification so you'll pull the trigger on buying the kit