So, you need a Non-Intercooled VE injection pump.
1989 through Early 1991.
Late 1991, Intercooled, through 1993 use a shorter DV holder, so you'd want to swap those out if you ended up with one of those pumps.
Technically 1989 is by itself, but it's only a difference that matters if you're ordering individual parts in the top cover.
All I'd have is one needing a re-seal from a 1990, so I can't help you.
Mark.