Hi George,
Looks like a pipe that Carpy sells. IMO a nice looking pipe but no Yoshi. But always good for try out, and for a good price well done. Mine is also minimal baffled. Regarding the cam, yes I have but wanting and finding one are two different matters. I can have one custom hard welded if in real need.
Regarding tuning the roadholding of the bike, first one must consider what one wants with it. Road use, cruising, drag racing, roadracing etc. Once you have made your choice things really get interesting because it also matters what you prefer the bike to behave like.
I am giving my opinion based on my experience and expertise. There will never be a concensus about this. When racing a CB 750 K0-K6 a few things a bound to happen. You'll be weaving all over the place and when coming out of corner at considerable speed expect a terrifying speed wobble. Make sure all bearings are setup well, swingarm pivot and headstock. Tyres, the better they are the worse the bike tends to behave. Adjust spring loads, check alignment etc. Next step loose that swingarm, never found one to my liking and decided to build my own after the Dresda swings but stronger and longer. Mine is 40 m/m longer than stock. I use longer (360m/m)shocks (Koni). Trail on the 750 is too short, hence the prob's with wobbling and shaking. I use 45 m/m off-set. I use 18"front and rear. Use 35 m/m front from 1st gen DOHC 900. Much longer lowers which give more overlap. Added a stabilizer, but biggest improvement is a 20 m/m front axle. Makes the front much stiffer and the fork's tendency todeform under braking is next to zero. Another point for improvement is the way the engine is mounted in the frame, not good and under acceleration tends to move about in frame. Solve that and you'll have a safe and predictable bike. Could go on for hours but you have some to think about. Rob