Oil for my 76 Dodge 1 Ton

i have a 1 ton i pull my camper with, big block with stock cam and valve springs.
does Shell Rotella , still have any zinc in it?
what would work beings this is not High Performance vehicle, doesn't need the High Performance oil.

I'd use the 15w40 Rotella. Good oil and enough zinc in it.

Unfortunatly the Hi Po oils are about the only 1 that have Zink in them.. Diesel oil is 1 of the others but even those have less Zinz than they used to... Zink additives are reccomended..