Check to make sure yourtiming belt didn't break. Easy to do, just pull the oil fill cap and watch the cam as someone is cranking the engine.

You didn't mention if the fuel pump is running. Ususlly if there is no spark and the fuel pump is not running, this points to the fuel system relay, which is the one I think you already tried. Also it could be the hall sensor in the distributor. Or there is another relay, the radio supression relay that will cause these symptoms. This relay is located under the hood, maybe on one of the shock towers or the coolant expansion tank. Not sure as it varies by year. It is black about 1" X 2" X 2.5". You may also have a second relay that is identical. This relay controls the electric pusher fan. If you have two, swap them and see if anything changes.

Since you have a spare distributor, there is an easy diagnostic that you can try. Connect the hall sensor electrical connector to the spare distributor and put the ignition switch in the run position . Spin the distributor shaft and the injectors should click and the fuel pump should run. The hall sensor puts out a series of pulses that used by the ecu to indicate that the engine is rotating. When this signal is valid, the fuel pumps are energized and the ignition system is enabled.

Check the FAQ for much further details on this set of symptoms.

Dan