I have an aftermarket AutoLine 8114A carb on Magnus (79 F150 351M auto). I couldn't find a rebuild kit online so I emailed the company - this is the response I got:
Is there a "universal" kit available? Should I just replace the carb?

 

Is that a C underneath the screw?
More Information for AUTOLINE C8114A

 

That's just a rebuilder's tag. Rely on the model of the carb rather than that thing.

... unless they modded the carb with some one-off, hard or impossible to find parts.

 

This should do it. Bruce
Walker Products 15593D - Carburetor Tune Up Kit | O'Reilly Auto Parts

 

Now that's interesting. I found a handwritten note in the owners manual that gave a part number for a replacement carb. I will take another look at that.

 

Thanks, Moose. How do I know that one has the correct style accel pump, base gasket, etc? I have seen different ones in different kits.

 

I haven't seen a C under there but will take a closer look. In either case, I have searched for this and still not found the specific kit.

 

That Rockauto link goes to the Ford part numbers for the carbs. Many 2v carb kits of gotten have extra parts for different applications.

 

This was the key! I went back to the owner's manual to look at the note:



And NumberDummy comes through again (from an older thread):

 

Kit ordered - thanks for your help guys.

Ford Mustang 75 80 171 255 302 351 400 Carburetor Repair Kit Motorcraft 2150 | eBay

 

Typically the original tag number for the carb and be found stamped on the side of the carb base, just below the driver's front hold down bolt or stud.

This stamped number may not be as complete as the tag number but has enough information to identify the carb as to it's original application.

Good luck.