That is a strange I.D. number on it. If I remember right, the 4300 series of carbs didn't have the tag, just the stamped ID on the foot of the carb. All the numbers I've seen started with a letter followed by a number. The letter represented the decade and the number the year in the decade. I have a D3ZF-MA on my '73 Mach 1. It's a period correct Motorcraft replacement for what was original. I'd be interested to know more details about your carb if you find any info.

http://www.network54.com/Forum/88781

Folks on that site would be able to give you some info.

 

IIRC, the 4300 on my wife's 69 M code 351W has a tag on it.

 

By the passenger side front mounting hole, on the side of the baseplate, there should be a stamped part #. Clean the side of the base with steel wool or similar and the # should show right up.

 

The number on my 4300A carb is D1OF-AAA from my 71 Mach 1. It is the original carb. CFM is about 480. This carb was stock on 351C 4V engines. It may have been used on others also.

Steve