I've had a look through my race programmes and come up with a few hits (the filename of each image is the programme date & race venue):
This photo was in the 1990 SFOS programme - but would have been taken earlier.
I have some entry lists for SI Pre-65 racing from 1983 onwards but the Gazzelle doesn't appear after 1982.
At the 1990 Southern Festival of Speed programme there's a Gazelle entered by Jim Kennett of Rangiora. Same car?
Over the same period Dave Craw is also often entered in a Sunbeam Allegro. Small block Ford V8 in a 1970 Sunbeam Rapier. Interesting !