Not a lot of black magic Paul.
Back in Shellsport days there were two Starlets that really flew. One belonged to Warren Burt, the other I know a bit more about, cos I was involved with building and maintaining the beast.
It was a 1300 4K with the engine stood up so it could run 4 dellorto carbs off a Ducati? motorbike. It was driven by Malcolm Webb. AT Pukekohe it wasn't competitive, but at Manfield and Bay Park it was very!