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Take the distributor off of your car and put it on his once you get his off. Set the timing and see if it runs. Will let you know if the problem is in the distributor or in the switch.
Talk him into going back to the stock set up on his distributor.

If the distributor is stuck don't pry on it. Call Bert's and order a puller. It will be there by the end of the day Friday if you order it Wednesday morning.
They work like a champ. Just be sure to oil the threads on the puller before you use it.