Something else I noticed is the battery is grounded to the engine and front of car by headlight but there is no firewall ground. Should I add one and if so what size wire do I use?
The rad support/ inner fenders/ firewall is all one welded piece. But even the factory battery-to-body ground was 'weak'. I like to upgrad it. One way to do that is to look at the holes in the pass side front of the head. You have the SAME holes, unused, in the rear of the driver side head. Get a short starter cable, and bolt to the rear of the head, and bolt that to the firewall securely, the master cylinder studs are good