Buy the 1990 and stick the 6.2L in it! Itll give you a good chance to run all new fuel lines new wiring for the lift pump, etc. Good chance to start clean.
Good luck in whatever you end up doing. I wish I could be of more help
Blue 1990 GMC K2500 Camper Special, 6.2L "J" code
NV4500 5spd. 243,000 miles - Resting in pieces in truck heaven
White 1988 GMC Jimmy. 6.2L "C" Code 700R4. 64,000 miles.
Got stolen and rolled.....Will be greatly missed
Blue 1992 Chevy K2500 Ext. Cab Long box.
Mechanical 6.5 GM-1 turbo w/turbo master.
NV4500 5 spd
Blue 1985 Chevy K10 Regular Cab Long box.
SM465 4spd Currently getting the 6.2 from the Jimmy