Distributor removal help, Stuck. Wont come out Options

[EJP914]

I am trying to remove the distributor from my '73 1.7. I have removed everything incl the 13 mm nut under the vacuum advance canister. I was told it will now just pull right out. No go. I have soaked the heck out of the base of the distributor with PB Blaster and it still wont pull out.
I am taking it out because the long clamp bolt at the front cannot loosen up and I am afraid of snapping it off while the distrib is in the car. Does this bolt need to be loose to remove the distributor?
Any suggestions on how to get it out? I am getting close to taking a pry bar and trying to lever it out.
Many thanks for the advice.
Ed

[EJP914]

Thanks guys. I have removed the 13mm nut that holds the distributor to the engine.
I was told once this was removed, the distrib would pull out.
There was no need to loosen the long 10 mm clamp bolt???
Forgot to mention in first post, this car has been sitting for about 15 yrs. Trying to get it started.
Got oil pressure, fuel, but no spark. New plugs, wires, points, coil. Only left is the condenser. That looked impossible to change while the distrib was still in the car.
Plus I know the distrib needs to rotate for timing / tune up purposes. Have to get that 10 MM long bolt loose too.

[GregAmy]

Thanks guys. I have removed the 13mm nut that holds the distributor to the engine.
I was told once this was removed, the distrib would pull out.

That is correct.

There was no need to loosen the long 10 mm clamp bolt???

No. In fact, on a properly-tuned engine, NOT removing that allows you to retain ignition timing when you reinstall the disty.

Forgot to mention in first post, this car has been sitting for about 15 yrs. Trying to get it started.

Does the disty rotate?

Ensure that the clamp is not hung up on the threads of the stud where the 13mm socket nut was. Then rotate the disty while gently prying up on the clamp.