Afb Id?

I just dug out an AFB that I've probably had stored away for over 30 years. Can somebody tell me what it came off of? My best guess would be a big block Chrysler product from the sixties. The tag number is 4299S. It also has 4299S stamped in the body & the number 66 stamped below it. I'm figuring I must have used it on my 273 at one time or another.