So I bought another bike.... Kwakka GPZ 600 in very, very sad condition

That's a nice find for threefiddy dollars! I had one of these about 10 years ago and myself and a mate built up one acouple years ago as a cheap track bike for him. All done only cost under $1500 and I ended up racing it a few times in historics, even got 3rd overall at a meeting last year and won a sweet trophy! The biggest trouble we had was getting the jetting right. We used a dynojet kit with home made pod filters, it was a right pain in the arse and in the end don't think it made any more power. I would suggest using the stock airbox, not pods.

He may have some spares available as obviously all the road gear was stripped off, if you need anything let me know.