Draining the gas tank seems a bit extreme. That will just make the car hard to start won't it?
And, Beowolf, that horizontal bar between the gas pedal and the clutch pedal is actually called a brake pedal, (I did a search of old archives to find that data).
So, since no usable advice has come from this thread (except for the throttle hang thingy - still have to try that), I think I'll have to submit this question about excessive speed to Ford Service online. I'm sure they'll have an answer.
I'll keep you guys posted on what they write back.