The good news it that the low lift cams in the 4.0 don't have the problems with the new oils that the old high performance flat tappet engines do. So you are probably OK running any 10w-30 or -40 after break in.
VR1 is probably the best conventional with high ZDDP that should be fairly easy to get.
All the newer energy conserving, emissions friendly oils have much lower levels of Zn and Ph (ZDDP) in them and aren't great for flat tappets or distributor gears.
Oils 40 weight and above are allowed a higher amount.