"I only say that because when I put the light on it, and rev it up, the timing marks does not seem to move, is stays on the 19˚ that I set it at. Is that an indication that it's stuck?"
In a word--Yes. The top section of the distributor shaft (the part that mounts the rotor and has the points opening cam) is independant of the lower section which is driven by the intermediate shaft. The little felt pad under the rotor is the source of lubrication for this mechanism. After a time the close tolerance between upper and lower shafts gets gummed up not allowing the advance to work. Taking apart the distributor is not too difficult. If you remove the roll pin (located under the spring wrapped around the offset drive) holding the offset drive ----- rotate the shaft so the rotor mounting slot is facing you and take note of the offset relative to the rotor slot. Now you can drive out the pin to allow removal of the offset drive. -- Dave