Maybe Nick might have heard about this car. Maybe you can post a video of the car idle, I remember hearing Kurt Gutza car that had a lopey idle. I think Toolman now owns that car
Welcome, car looks great. Check out Shosource, they have a supercharger set up
https://shosource.com/products/ols/products/sho-source-supercharger-kits-89-95-mtx
Koni has been obsolete for while for SHOs. You might find some that someone might be selling. if you search for "Struts" in this forum, there are recent post of other looking for parts. here is an example of one post. you can probably get the whole strut assembly if you look on Rockauto...