I saw that after I typed it in your other post - got it.
I know not of the engine reliability - but at nearly a quarter century old, if not maintained I'm sure you're going to some maintenance (all old bikes do) and may have valves to shim. Any online pics of the bobber work?
Is it a shaft or chain? I remember they came in two styles...and then they also had the police model. I had a 80 kz650 which shared some insight from the kz1000. Here's what I remember from the old blue belle..
1. Accelerator pump can gum up but an easy fix with a rebuild kit
2. Ditch the points if it has them, unless you like timing lights and old school - get a dyna ignition system, replace the coils if still original. don't even question just do it.
It's heavy - it's fast - suspension and brakes will need some serious consideration. Others that may have had the bike can chime in here more than me, but that's what I remember.
I may not have a lot to say but it doesn't mean I don't listen.