Just had an '89 Monty (with EFI!) come into the shop. 281,XXX miles on it, still ran like a champ. What tough trucks. There's so much space in the bay, it looks like a Paxton supercharger wouldn't be too difficult, at least compared to today's jam packed engine bays.

Rahtid, do you have more information on the OEM supercharger? Specs, model, etc.?