That top plug is getting very close. You have enough ignition you can get the tune to where the upper part of the porcelain is a dull white. That would be about dead nuts.
Still looking at the top plug in these pictures, it looks like the heat range is about as good as it gets. Dry on the shell around the flat, 2 or so threads showing heat...that's about spot on.
Can't see WOT with the shells on and you'll need to make a hard pull to get a clean fuel ring down there.
Also, I don't know what you have for timing, but from the picture it looks like you could use a bit more initial, or bring the curve in quicker. Or maybe both.
