Thanks Mark. I hadn't checked anywhere yet to see if I could buy it. However, I think I have it repaired properly now. I also now understand how it works, i.e. can't test it when it's not under load.
I hope to have the car ready to run in the next couple of weeks and I'll test it then.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)