With that amount of mileage on the vehicle, there is a good chance that the timing chain has broken or jumped out of sync. One way to check that would be to remove the distributor cap, and then turn the engine until the tip of the rotor is pointing
directly at the location of the terminal for the plug wire that goes to #1 cylinder. (If the rotor does not turn when you operate the starter; the timing chain is definitely bad.) When the rotor tip lines up VERY CLOSELY with the terminal for #1 cylinder plug wire, the timing mark on the crankshaft pulley should be lined up with the marks on the engine block; somewhere between TDC, and 10 degrees to the left of the TDC mark. If the timing mark on the pulley is not near these marks on the block, when the rotor is lined up as described above; the timing chain has jumped.
Another way to see if an engine has jumped time is to run a compression check. If the compression pressure is below 120 psi, then the chain has probably jumped.
If the timing chain is not bad, then you probably are not getting spark. That would most likely be caused by a failed ignition module, a bad distributor cap, bad plug wires, or a defective coil. Another, less likely ignition part that could do this is the ignition pick up unit.
As the other poster experienced; pre 1997 Dodges will not run if the O2 sensor heater becomes shorted; but this will not prevent a Chevy engine from starting. Chevy emission control systems do not have the infamous Chrysler design defect.
I hope this helps!!!