Ok... so let's talk about the 2nd GS750 - however it was the first one I purchased.
77 GS750 frame and a GS450? fuel tank. Original 750 engine was bored to 850 but a cam cap ripped the bolts out. Long story, no need for it now.
95 Katana GSX750F engine, wiring harness, coils. Unknown exhaust. Ram Air filters.
2002 GSXR750 suspension although the rear is strutted.
This bike is amazing and still being tuned. Will be painted soon.
If you have questions about either swaps, I should have the answers. These were both being built over the last few years with engines bouncing around from frame to frame. Did have the GS750 engine (bored to 850) installed in the yellow 750 after fixing, but the rings collapsed and I set it aside (all new clutch stuff and fresh cylinder head if anyone's interested) and then installed the 1000 mill. This is how I went looking for a replacement engine for this bike and found the GSX750F... I have a GS550 that is getting merged with the leftover Katana parts... engine needed here LOL