I know there was a 71 440-6 project not too far down the road in Howell NJ many years ago but I recall it to be a shaker and I think rubber bumper & louver car - but it was a long time ago. Was it one of the promos or whatever possibly? I always wondered what happened to it. I even had the opportunity to buy it for 11k, but it may as well have been 111k, I was just a kid. Owner also had a 440-6 R/T SE Challenger and some other cool stuff.

If you haven't already you might want to also try asking around on the "Englishtown Memories" (Raceway Park history) page on Facebook as there seems to be quite a few still on there from back then, someone may remember it.