Oil

Man, just run 10w30 in the thing like Chrysler recommended. This ain't rocket science. Simply make sure to run an oil with plenty of ZDDP or run an additive. I run 10w30 Lucas Hot Rod Oil in my 75 F250 and in my 64 Valiant. It already has 2400 PPM of zinc. That's all they need. No need for anything fancy.