Can motor be UNSTUCK????
This mixture here has never failed me :
Take a Quart Jug (oil or trans fluid)
3/4 Diesel Fuel or Kerosene
Not quite a 1/4 Transmission Fluid
top it off with Brake Fluid.
Shake well and fill each cylinder, let it sit for a few days. It will remove rust like you wouldn't believe and will free up even the worst of the "lost cause" engines