If it were me, I would start with an Edelbrock intake, carb and cam package. A set of Hooker ceramic coat headers, dual exhaust with some nice free flowing mufflers and update the ignition to the H.E.I. I was not a fan of that, but it seems to be the hot ticket today, and has improved performance for everyone that did it. Also a good air cleaner with a cold air intake will work wonders.
Ken Schwarz Tricky Truckers, N.J. Van Clan Plus One, Canada Manse Vans, Finland Rebel Vanners, N.J. "USA" Toopa Sinner Tribe, N.C.