Mustang 5.0 Ho

Hello colleagues, my problem is that I have a Mustang 5.0 cc HO engine, with Hall ignition beer, the main problem stopped and did not start I changed the ditribuidor's dust and starts but it is that I have a spark in nothing more in two cylinders and sometimes gives for a third party, the distributor only makes those 3 sparks, then I do It has touched inside, I don't know if that could be the problem since when the distributor's collector loses signal, and when I release a lost spark and do this to me, the spark always gives it in the same cylinders, only the third that once from time to time.
I hope they can help me with aki in the Canary Islands there is not too much information from American vehicles, and the spare parts cost me a lot to find them.
Thank you very much in advance, I hope you can help me or if it is possible to guide.
I am a mechanic of Ford, but Europeans.
thank you

Friend, the distributor's lid is very checked because if it is trisada somewhere the spark goes out for anywhere or is isolated, the same happens to the meches, or try a little oil on the lid to isolate it to see what happens.

If c is about a hall system like the one that I know ,,, proba for the simplest, the rotor, if that has a resistance or something that is eating the spark ,,, the other is that your captor this bad this bad