Mini13,
That is one wild motor! I hope the broken cam belt didn't do too much damage, although I can't imagine how it didn't.
I hope you manage to get it going again soon so we can see some images, or even better see it in the flesh one day.
As far as Wrinkle finish paint is concerned. I have used VHT & Hycote. I get on fine with the former & have never had any success with the latter. As Jan has said, it is very much dependant on the finish you are looking for & it can be enhanced or altered with judicious use of heat & more paint.
I used to reccon I had a "magic formula" for crackling, but after a few partial failures I reccon the best method is to do a few test runs each time.
Also, make sure you wash the nozzle out with thinners after EACH TIME you stop spraying as the paint sets in the nozzle very easily & will stop he can from working!