Need Help With Engine Diagnosis

Unfortunately, it's going to be a few more days before I can dig into the carb. But I did want to answer a question. I used some Fel Pro Head gaskets that were advertised as great at stopping leaks they 'may' have been a teeny bit thicker, but nothing that would cause a significant drop in compression. Plus, the way it falls on its face and sputters after 4000 or do RPM, I doubt that could be it. I am leaning towards carb or ignition.