Glenn,
I don't know where you are in MO, but there's a member of the IsuzuPup.com site who is Memphis,
MO. Actually, iit's a couple (Dart and Deb Escue). They go by the username "debsq". They deal in a lot of used P'up (and of course 2nd-gen LUV) parts. They may have what you need.
There's an '86 P'up at the Memphis Pull-A-Part that also has the lights still in the bumper. The one on the bumper end (passenger's side) is cracked, but the one on the front of the bumper looks fine. I'm going over there this week to "clean up" and I don't mind pulling that for you if that's what you need. I pulled a BUNCH of stuff yesterday, including the ENGINE!
You really should diagnose your fuel system rather than adding an electric pump. It sounds like you have a simple air leak--that's the classic symptom.
I pulled a heater core for someone a couple of months ago, from a '90 Trooper. Trooper cores through '91 work just fine. It's best to get the newest one you can. If you wanted brand spankin' new, we have a forum member who can get any new parts that Isuzu still sells (he's retired from Isuzu). But the new core is over $200, I don't recall exactly how much.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com