Haven't heard of it Ellis but wouldn't be surprised, in the early years of dirt track saloon racing many used FJ Holdens and i'd say back then it would have been the old grey motors, saloon racing on the dirt was a recently new class back then and i can remember Trevor Grey in a very quick FJ at the old Forest Lake Speedway in Hamilton racing door handle to door handle with Ross Decke in a LIP Vauxhall!! im probably talking 1970/71, i was just 11/12 or so at the time, amazing what we can remember when need be!! was great memory's from a long time ago.
I was just 15 with a licence and one of the local hoons around 1975/6 in Tauranga had a hotted up grey motor in some old car like a Austin 7, i always remember him doing burnouts in reverse, he used to rev the shit out of it, LOL
Dale M