There are some pictures in the Jim Schild Challenger/Cuda book. The 74 yellow cuda in there was a stunning reference restoration when seen in person, out of Detroit at the time. I think it was written up in a magazine or two if you can find it, I saw it at the Mopar Nats...probably around 2010 or something like that. The 74 had the heat switch in the radiator, the catch bottle, etc and the pictures show that. There are 5 pretty good ones. Here is the car at Mecum...

https://www.mecum.com/lots/FL0115-203335/1974-plymouth-cuda/