Adding a bit to the others advise. There may be a build up of gunk on the boss behind the distributor where the engine number is. If you don't see anything on first look, scrape the gunk off & look again. Also if you have a numerical "1" as part of the number it will be represented as the capitol letter "I".

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.