Intermittent misfire

[12jslater]

Had a good look at the valves today, very clean, and all seem happy, I don't see anyway they could be sticking, I've now ensured the points have a good connection and cleaned any tiny bit of dirt of any connections on the coil and points they are absolutely spotless there is no chance of a bad earth or a dodgy connection now (not that there was much of a chance anyway)

I'm wondering if there is anyway it could be the head gasket? Or even a crack in the head. Even though compression is absolutely fine and I have no signs of water in oil or one very steam cleaned spark plug haha.

Just a thought