Possible flooding issue 1920 holley
That carb's going to be badly overdue for a rebuild. Probably has a heavy float by now, too, and new ones have grown difficult to get hold of.
Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted
here for free download. To reduce heat-soak flooding, do the
fuel line mod and make sure you've got the correct thick carb base gasket.
Tune-up parts and technique suggestions for your Slant-6 are in
this post. Eventually you'll want to do the
Fuel line mod and the
HEI upgrade , and consider the suggestions in
this post.