Trunk Battery Ground to Engine Connection?

I really don´t know, but did the SS Hemi A-Bodies (as delivered) really have a connection from the trunk mounted battery, to the engine?
Or was this one of many things Chrysler left for the racer to fix.
Picture is of the Mule Car, and as such not representative for how the SS cars were delivered.
The one cable running through the firewall next to MC offset block, I haven seen on other cars...

To me this connection is essential, but on the other hand I don´t keep up with all the latest in racing know hows.
Or maybe this wasn´t necessary with the Transistor Ignition :)
Times in the high nines the very first year was possible anyhow, with or without battery ground to engine connection… now, witch was it?
Any insight info all ways interesting.
mule bat cable.jpg