I use the ford type solenoid on the back of the pass side head, for the main power heading to the starter. The GM solenoid is wired direct, (little wire right to the big battery cable) this keeps the starter 'cold', or not live unless the starter is engaged/spinning. I do this on all the GM trucks, too. It helps with heat soak on the starter/solenoid
On the daycruiser (starter eater) I had 2 starters,top mount and standard GM location, and when one quit, I'd swap the solenoid wires, and use the other starter for the rest of the day
Dan'l