[tomj76]

I have the 3.8L engine, so I don't know as much about your 3.0L setup.

I think I'd try spraying a little bit of fuel (ether/starting fluid) directly into the intake when cranking it, just to be sure it isn't fuel delivery related, although what you've done should be sufficient.

The compression seems good, but low. Did you have the throttle open when you ran the test?

When you removed the plugs, did you check for spark?

I don't know what "ignition retard shunt open" means. Is this talking about spark advance? If so, that is controlled by the PCM, with inputs from the CPS & CMP. I don't believe there is any other system in the Windstar for timing advancement.