Scot,

If you plan to keep the truck/engine for a while, you might want to get hold of a 1960 Owner's Manual and 1960 Shop Manual (from a production parts vendor or on eBay).

The 1960 Chevrolet Truck Owner's Manual has information on oil types.

As stated above, an oil filter was not standard equipment. GM sold AC RPO oil filters, Fram was also commonly used, and there were filters made by many other companies (Sears even sold one)).