I have this 1934 Hershey's recipe booklet that has at least 12 cake recipes, though none of them include 2/3 c oil.
If you'd like one of these recipes, just let me know.

Chocolate Gingerbread Square
Gold Chocolate Layer Cake
Mocha Devil's Food Cake
Devil's Delight Shortcake
Chocolate Graham Cracker Cake
New Hampshire Applesauce Cake
Chocolate Iceberg Cake
Chocolate Fudge Cake
Chocolate Marshmallow Loaf
Chocolate Shadow Cake
Alsatian Sweet Chocolate Sponge
Chocolate Nougat Cake
Hershey's Special Cake
Chocolate Marshmallow Sponge Square
Chocolate Peppermint Roll