The bigger problem you'll find is get the male terminals if you need those too. i never have seen those being sold around.

I have used the later male plugs into the older female plugs such as later engine bay harnesses into my 74 bulkhead and they fit. Now, I can't say if Female terminals will fit correctly without any play into the plugs. Males definitelly not. What I made once is cut the later engine bay harnesses with couple of inches of wires from terminal and splice it into my harness.