CARTER 6866 FUEL PUMP DATE CODE

I have a Carter fuel pump part number 6866 for small block Mopars but don't have the info to figure out the date code?
The complete number stamped into the fuel pump is: 68667E21C.
In addition this pump has "MADE IN USA" cast into the side.
Thanks!

you could call carter tech and see if they could help, but those numbers are for more modern versions of the pump and not normally worthy of worrying about date code. It is not a 60/70 or 80 date code.