Very good point Jerry, honestly it doesn't matter to me how much oil is in it, I was just worried that there wouldn't be enough. Once I pull the pan I'll take the measurements and go from there!
52Carl - Probably before I was born! Supposedly the trucks been sitting since the 80s. The old oil was a little sludgy when I got down to the last bit when draining.
I originally wanted to get the engine running, then pull it....but I'm tempted to go vice versa now.