Suspension.. I would recommend Toplines Adjust-a-Strut and Kyb GR2s for the rear.
7/8" Sway bar also.Engine. Some kadrons would be nice and a header..even high lift rockers.
Body wise.. not muchyou can really do there to enhance performance, mostly just asthetics. Some will disagree,but in my experience I have found that the Kamei chin spoiler does make a tremendous difference on the highway.
Jeremie
1972 SB