DL is refurbing their 763's with new seats with winged headrests and AVOD with HBO for purchase.
The older 763's have the flat headrests and overhead movie screen
They all should have buy on board food, which from the menu looks fairly reasonable.
Equipment changes are frequent at ATL so be sure you check your seat assignment often if you're on a 763 as I have been moved to a middle seat with out my consent before.