I got some time last night to give the injector test a try. After freeing the injector rail from the intake manifold gasket I resecured the grounds to it (I had to fill the gap with a spare nut to completely secure the grounds). After a towel was placed under the rail, I used clean baby food jars to capture fuel spray on the rear 3 injectors while I observed the front one. The plan was to swap the jars around as I went.

Well, that wasn't necessary, because no fuel sprayed from any of the injectors. We tried cranking with and without the application of throttle, but no change. I touched each injector pintle, but they were dry as a bone. Just to ensure that I didn't have a loose ground, I used the noid light and the injectors were getting pulse. What was weird is that before this test, I recalled the fuel gauge showing about a quarter tank with the fresh gas I added. This time, it only moved a little bit, like a 32nd of the gauge, but that might be a red herring. Some of the vacuum hoses were disconnected since the routed around the fuel rail, but that should only cause a no start condition.

Anyway, given the result, I'm going to order a remanufactured injector and try the test again to see if that one sprays. It seems weird that all 4 injectors would completely fail this test, but maybe it's not so strange.
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In a car sitting a long time the injectors could well be gummed up...

 

The new injector is arriving Wednesday or Thursday, so we should find out soon.

 

For those of you who are curious, I received the replacement injector and installed it this morning. There was still fuel in the rail after pulling out the old number one injector. It looked pretty varnished. Anyway, after installing the new injector and having a partner crank the engine, once pressure was built up, it squirted. I think we found the culprit. Who would have thought it would be something so basic as injectors? Of course, that was the only thing really left.