My guess with your car is the timing chain, but here's what happened when my car locked up on me.
In my old 84 I came around a corner one day on the way home from school and the engine siezed. Towed the car home, pulled off the oil pan, and the crank was broken between rods 3 and 4. This was on a car with rather low oil pressure, and it had 140,000 miles or so on it.
In my old 84 I came around a corner one day on the way home from school and the engine siezed. Towed the car home, pulled off the oil pan, and the crank was broken between rods 3 and 4. This was on a car with rather low oil pressure, and it had 140,000 miles or so on it.