Thanks for the ideas.

The starter on it was locked up, and I'm not sure if I want to buy one for a motor I have no interest in. I'm rebuilding a 454 to replace it with.
I just got to the flywheel and it's not turning easy, or at all.

I'm not certain the clutch isn't stuck in some form as the truck is super hard to move. Haven't checked the brakes either.they don't work, but I bet at least one is dragging.