Are my spark plugs still misfiring?

[57taskforce]

Based on what I’ve read, I’d bet your valves are too tight, I prefer to adjust them with it running because your can get them fine tuned just right. I only 1/4-1/2 turn past when the pushrod stops tapping the rocker.(too loose) plugs could be an issue and are easy to change but it seems like you’ve ruled them out, I would have replaced them when doing the top end rebuild bit can certainly understand why you didn’t.