[Blas]

Rear shock mount inspection and possible replacement is really mandatory not for the bottom of the list. Your shocks are quite old at this point, but it's not like its a 3800 lb. daily driver with 80000 miles on it. People like the QA1's who have made the change. Same goes for the ball joints, springs and sway bars. Everyone I know who has upgraded them have been pleased with the results but lighter in the pocketbook for sure. The Shimmy, well, that could be a lot of things: tires, rims, alignment, front axles, etc.... no guarantees on that issue disappearing.... pretty much trial and error on that one. Check you wiring, add a correct kill switch, and relay for electric fuel pump. Roll bar needs an additional bolt on outside leg. But first inspect the rear shock mounts. Perhaps track the cars a little first to find problems and then make changes. Car may outperform its driver as it sits?
If it ain't broke don't fix it....
Blas