OK- maybe I'm kicking the can down the wrong road here.
A little history: Ford 460- common problem are the head bolts, particularly rear bolts passenger side. Several years ago I had one break and I managed to drill it out in place and re-tap it. Only I didn't get as many threads as I would have liked to. That resulted in a minor exhaust leak then finally a drip of coolant. A 2-part sealer actually stopped the leak- maybe at the cost of some cooling capacity.
So- It stays within range on grades but I don't want to fry the transmission. Of course if I had the money to put in a 20 year old RV I'd have the heads shaved, deal with the head bolts and put on headers or a Banks system.
What I'm thinking is a cooler and a triple gauge cluster so I can monitor what's going on. Waste of money?