I also have a cb750 (80) and a vfr750 (93). I bought the vfr for the swingarm forks and wheels to be used on the CB. I ended up fixing the vfr keeping it in tack. It's a lot of fun to ride and I love the v4 engine with gear driven cams. It also gives me a great bike to ride while I rebuild my CB.
What year is your vfr? The gen 3 90-93 and 4 94-97 are the best in my opinion. They are they last to not have any linked breaking. The plastics on those bikes bring stupid money on eBay. There is no aftermarket option so people even pay top dollar for cracked fairings to be repaired. If you have any plastics they are worth a good bit.
A few things I noted on these two bikes. The front wheel of the vfr does not have a speedo housing, it is by the clutch slave cylinder on the left of the motor. Also the forks are quite long. These 2 things don't make it a great swap option on the CB compared to a 90s model CBR. Although it's possible to do a stem swap and there are a few types of speedos that you can make work. Lowering the forks should not be bad either. A cb with vfr running gear would be really cool and not impossible. It's also not common because it's not easy.
The vfr has a great following I'd suggest keeping it together and selling it to a vfr entusist, use the money for your primary project. Or sell the v4 engine and buy the missing vfr wheels and a CB engine then build the CB with VFR running gear.
Best of luck!