Wow. That's cool as shit! My truck was free. 1987 Dodge Power Ram 50. Not a V6, but I have a free V6 going in, if that counts???

These trucks seem to be pretty reliable. I would say check fir leaks, valve seals maybe? Or just worn piston rings. How many miles does it have? I think somehow the oil is in the combustion chamber, albeit blown head, head gasket, or something that is supposed to seal oil from there such as piston rings. Given the engine shake I bet that the 2 are related.

But still cool to see a truck sit for so long and then fire right back up!