Yes, it will fit.
The KZ750-4 engines were loosely based on the KZ650's, and in fact share quite a few engine parts.
The most you might have to do is fab a diff bracket to mount the muffler in the rear.
Covina, So Calif!
78 KZ650-B2 = SOLD
84 ZN700 LTD = SOLD
84 ZX750 GPz = SOLD
89 GSX1100F Katana = SLEEPING 
20 VN1700 Vulcan Vaquero (the Blue Cowboy)
Looking for my next project KZ
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