There is another one I was just dealing with. The small ( I think #10) wire molded into the engine ground cable clamp from the negative battery terminal to the core support.
The post above mentioned 4 others and I want to make sure I have every found point covered. Does anyone have a picture of the engine to firewall ground wire on a 70 RR? I looked at both my service manual and parts book and found nothing. I have heard that some Mopars had the engine to firewall ground wire (or braid) but I have not seen it on a 70 RR. I also cannot find a point on the firewall that looks like a connection point but, it may have been covered during the last bad restoration done by Dr Howard, Dr Fine, Dr Howard..