First off, get the Bentley manual--it will save you a lot of trouble.
Then, call New German Performance, just down I-95 from you in
Maryland. They kept mine running well long after there was any
factory interest in it.
Next, before you do anything else, get the supercharger belts
replaced. I'll bet they need it if someone was really cranking it.
You don't want to know what a new supercharger will cost.
And a whole set of Bilsteins shouldn't be over $400.