I agree, sorta, with the others. Pull the valve cover and the spark plugs. Drain the oil to see if there is any water/coolant in the pan. Soak the cylinders with the penetrating oil of your choice. Then wait... a few days or so. Then try to gently turn the motor by hand, with the fan, or with a big screw driver on a flywheel tooth. Or by jacking up one rear wheel with the trans in high try to rock it back and forth. If you can get it to turn completely around without binding - then you can probably get it to run. Of course fill with oil. Some suggest priming the oiling system by pulling the distributor and sticking a big screwdriver bit in an electric drill in the oil pump slot and run it to pressurize the system... Then if you can get it to turn by hand, with the spark plugs out and full of oil, turn it over (and over) with the starter... Good luck.
You'll be so proud when you get the old thing running. There's something about reviving a sleeping old motor that is satisfying.

Professional Novice