Churchkey wrote:
Has the ignition timing ever been checked?

Unplug the single black weather pack wire connector for the tan/black stripe wire located @ the top of the brake booster, set timing @ 6 degrees, plug the connector together.

This is going to sound dumb but stranger things have happened. Is the emergency brake completely disengaged?
On mine if I do not hold the button in until the lever is all the way down on the floor the E brake is still applied.

One thing for sure you certainly have patience. If this were my job I probably would have torched the sucker by now.

Good luck.