I also had one, an 84 750. If you have the stock exhaust, keep it. The bike will run stronger, smoother, and sound way better with the stock set-up than anything else you could put on there. Also make a VERY close inspection of the intake manifolds. They will have dried, and potentially cracked given the age of the bike. Sucking in even a tiny bit of air will affect the bike's performance. I replaced mine twice.
To be honest, I never really cared for mine much. I didn't like the handling, I found it rather twitchy.16" wheels likely why. I had just come from a GPZ 750 which with it's taller wheels and longer wheelbase was a freight train in comparison. The Honda was smoother than the GPZ, which is really saying something. I also tried slightly lower handlebars getting more weight over the front which seemed to help a bit.
Don't buy cheap or shit tires. Grip is everything with this bike.
A well set-up, good running model, is about as maintenance free bike as you can get.
If you get far enough away, you'll be on your way home.
Piss off, I'm in my Happy place.