360 mag with X heads anyone?

You had the valve covers off. What do the rockers look like? Shaft mounted stamped steel like stock LA or some sort of aftermarket. If stock style, it most likely will be a 89-93 pre-magnum roller block that still has the LA head oiling path. If they are aftermarket rollers, they could be oiling through the pushrods (or not) but you won't know for sure without taking it apart further. Before you buy a cam, you better figure out what you have for lifters. Flat tappet or roller. You can run FT in a roller block I think.