No grounds on my heads. Ground cable in the back to the cage. 2nd ground from the torsion bar cross member to the transmission. 3rd ground cage to block. I did see corrosion between the water pump and motor plate, none between the plate and block. Also some pitting around the water jackets in the deck surface of the heads. I'm going to add an anode and see what happens. Never any electrical or misfire issues.
Doug