Hello Dave UK. I think I can help with some additional information about your Challenger. I doubt everyone here is interested in much of what I have to offer, but you can send me an email :
1david711@gmail.com and I will share all I can. I am the guy who bumped the pan at the 78' Winters and we spun three bearings on the motor. (somehow the bump stops got removed from the car between Irwindale - Butler Racing - and the Winters and we didn't know it until we heard the crunch".) I was fortunate enough to get to spend some time with Joe and his wife at their home before we decided to buy the car from him, and I will tell you everything that he shared with us (including the "scales" incident when he got DQ'd up north. Not certain what you got from Duncan, but drop me a line and I will get back to you.