If you don't really want it and want something else, get it running really well stock, sell it, and get what you want. It will be faster and cheaper.
I'd open up that top and see what it looks like. If halfway decent put in new rings, clean the car and see how it runs. Then clean and sell. A good stock bike let's someone else deal with tuning, kit, pipe...
https://drive.google.com/folderview?id=1vxdUocvohov-VU1KVuOY-9YquFpw7fok (edited)