Would have 4280 in air horn and need date code 1968 December,to 2nd week of March 1969.Working unit or rebuildable core.email price and picture to ajcsportshop@yahoo.com,thanks
This eBay seller seam to have many with differents dates you want, according to the description. Price is serious but they are there.
https://www.cafr.ebay.ca/itm/HOLLEY-C9AF-N-4280-CARB-1969-MUSTANG-SHELBY-428-AUTOMATIC-FORD-/194286907581?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0
I have 5 N carbs all dated late 68 and the latest date i have is 4th week of dec 68 if u want it remember these carbs can be pre dated by several months and be correct as l have seen original cj cars with carbs dated 5 months before car was built.
Please email me the details,Ajcsportshop@yahoo.com