I found a further image that has Henderson in his Corvette in a production sports car field at Amaroo Park in about 1978. I have zoomed and cropped the image to show Henderson tucked behind Fitzgerald, Mathieson, Bond and Trevethan.
The Healy Corvette at the time owned by Sid Candy. Firstly ouside the Candy home with Ed's TR and Wally Bakers TF. Second photo at a Flying 1/4 at Ashburton.
I heard a long time ago that the car was destroyed by fire on the road from Christchurch to Timaru?