Engine shuts off while driving?

If you have sparks and fuel, the next item to check would be the compression pressure.

Water out of tail pipe after sitting for extended periods are normal as condensation in the exhaust system would be purged out but you need to check the coolant level to see if it is correct. Hope you have not damaged the head gaskets due to overheating.

Did you test the engine compression?

A jumpy tachometer is an indication the ignition coil is faulty and that could be the reason you are not able to start. Sparks might be present but are they strong enough? Are the sparks bright blue or dull orange?

Orange colored sparks means the ignition coil is weak and that can cause non starting. Get the coil checked.

Is it an OEM coil? Brand new?

Is the tachometer still jumping around?

After checking through previous replies and the data again, I seem to have missed out one important factor which you have written and repeated in last post.

Engine does not start with distributor in original position. This seems to indicate a fault with the ignition timing and the most likely cause would be a skipped timing belt.

A compression test might have shown the results. Remove the upper timing belt cover and check the camshaft markings to see if they are correct.