I recently ended up with a 66 F100 with a 240 and 3 on the tree. Runs great and just been going through fixing all the nickle and dime stuff. It has a steady drip coming from the inlet to the carburetor. I assumed it was a leaking o-ring, but when I unscrewed it, it fit loose and noticed the threads were stripped on the inlet piece (don't know the exact term for it). Threads are fine in the carb housing.
The carb is a Motorcraft with 3507 stamped on the side. I did some research and was led to the Napa carb kit CRB 25579
NAPA AUTO PARTS

I wanted to see if anyone knows where to source one of these, or if they come in any rebuild kits?

 

Hi neighbor!

I'm not familiar with that carb, but by the looks of the picture on the Napa site, that part looks like it's in there.

If not, is it a standard fitting? Could you just fit a pipe adapter in there that connects to your fuel line?