According to a yearbook I've got;
'74 winner was Laurence Bruce in a Mustang (Trevor Crowe 2nd in Chev Corolla).
'75 was Bruce Bellis in V8 Cortina with Bruce Jenner 2nd, Laurence Bruce 3rd
'76 was Kevin Haig in the Camaro with Jenner 2nd again, Rod McElrea 3rd
'77 indeed some bloke in a Capri......
Lindsay