I see (via Google is my friend) that Dale can give plenty of details of the ex Frank Bryan Mustang so that is a good start and at least it still exists.
Also found this from 67. I thought my memory as a 6 yr old may have been playing tricks on me but he and Dennis Marwood did race single seaters. I remembered Dennis raced a Sports Car...
http://www.sergent.com.au/motor/other1967.html