[GS-T_Driver]

Sounds like your 420A is toast. I would bet the bottom-end is shot from running it dry. The head isn't fond of that either. And if it over-heated enough, your head gasket may be toast as well. By the way, if you're thinking the timing belt went, 420A's/4g63's are interference-engines. If the belt snaps or jumps a tooth, the valves slap the pistons. I don't need to tell about what that means for that engine.