I doubt that a 86 GSXR and an 01 Kat are compatible. I think they upgraded the Kat in the late 90's. Some of the parts from old school GSXR's will work with old school Kats....but this might be a stretch for that big of an age range.
The reason he wants to try this is the forks on the Kat are screwed. see the thread in the suzuki section on 01 katana frame.
The 86 GSX-R1100 was faster and lighter than other Gixxers until about 2001 or so. The gold valves fix the damping inside the fork. You're right King Bob, the forks are the least of his problems. I thought when the forks were screwed, it meant not working correctly. LOL.
True they are the least of my problems but new forks will make this one less problem.
Suzuki made a very rare racing 750 back then. It had a dry clutch. If you have that one, it's worth keeping. Let's see a picture of this 750. It might be better to restore the 86 rather than the Katana.