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You are probably talking about the ground jumper that goes from the firewall, near the circuit breaker, to the engine block. I used one of the threaded holes in the cylinder head. I think it is about 8 to 10 gauge wire. This is for the firewall and instrument panel ground.
At the battery box, my car had a brass 1/4-20 insert pressed into the frame .. near where the shoulder belt bolt holes come through from the cockpit. That's where I put the battery ground lead. Someday, I will drill and tap a bigger hole and put a big lug there, but it works ok for now. And you mentioned the braided ground strap bolted to the frame near the tranny mount. Yes, this strap goes to the tranny housing.
So, we have battery to frame, frame to tranny, tranny to engine, engine to firewall, firewall to wire harness/ignition, etc. Yes, the firewall is riveted to the frame, but the rivets are not intended to be electrically reliable.
Sam
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