Distributor help

[JOHN CT]

I’m working on a friends 30 A. Having spark problems. The A ran fine last week. Now when It’s started sounds like it’s running on 2 or 3 cylinders back firing spitting. So I opened up the distributor just to take a look,and of course the modern points were in poor shape. I timed the car removed the cam and the upper plate. To install a new set of modern points. I found the lower plate is the wireless type. (I never had any luck with those) and also the 2 small screws the hold the lower plate on were missing and the plate was dancing around I guess the last person thought spring would hold it down. This is gotta be the reason why it’s running like crap right? So I installed one of the screws but of course other one of the holes is stripped any how now I know now I have to remove the distributor. Just for now let me just try to install the upper plate to see if the A will start, of course not!! I do have 6 volts at the beaker arm when the points are open, but no spark at the rotor to the plugs. I didn’t check the ign switch yet he told me it’s not a pop out it’s a plain on and off switch. What did I do wrong??? Please help I gotta go back tomorrow afternoon with penetrating oil to try to remove the distributor That’s step one!!
Step 2 the distributor is frozen to the head.
Thanks for your help.
The things we do to help our model A friends.