Hi stephan
Its a shame to sell when your pretty close to getting it going :( Maybe its best to do what I have and put it into storage for a while until the funds build up???
The front discs are off a honda legend from memory and yes they do fit with some 13" rims I had a set of 13x6 bathurst globes and they just cleared the calliper.
The engine you have is out of the bluebird is it?? woudl be fun in a little 1200 with that much power what kind of boost leval and revs to acheive that HP Im aiming 200kw at wheels with around 16psi It has made 190kw@wheels with 18psi but bodgee boost controler.
Good luck Andrew