It seems most comment that the Carter #4442-S is the proper unit for the '67 427 Fairlanes, perhaps being Ford #COAZ-9350-D, and sometimes the Carter #4399 (?) (difference?) is injected into the conversation, these perhaps as I have read applicable to a date of before 02/01/67?    Yes - No?

     Then curiously descending numerically for a later listed application, the Carter #4441-S, as perhaps being Ford #C7AZ-9350-A, is listed as being for '68-'70 Ford 427-428, as being applicable post the 02/01/67 date?   Yes - No?

     So where does the Carter #4254-S (descending numerically even further?) fit in?     

     Over the decades we have accumulated a few Carter "X" fuel pumps #4254-S that I removed from various 427 engines and set to the side ages ago because I don't throw to much away, and as it seems much of what I did toss turns out to be what everyone wants now, but that's another issue!     

     The question is:  Is the above information correct, and then what application is correct for this Carter #4254-S?  In looking it up, I find the application description of 1967 Ford 427, and that would be for what vehicle?  Why not the '67  427 Fairlane?       

     Thank you,
     Scott.