starters keep getting to hot need help

I would check WHERE I had that 3/4" ground to the frame, and how well it is connected, along with the other grounds. Make sure the connected are super clean and then put some No-Ox on them.

If all is clean try the battery back up front. I would spend the $$ to get a new cable or 2 rather than trust the old ones. If that does not do it, get a high torque starter. I had a similar issue with a 351C once upon a time (battery up front); a lot of compression and stock starter was not a good combo.