They look pretty good to me, all things considered, maybe a little rich, but that's better than not knowing. After all, there's likely a point where things are leaner, and if you were any leaner overall, that point could be a problem.
I have begun using a surface fire plug in my daily driver Corolla , the same plug as 2000 truck V6s came with, they add some power down low at least, not sure about the top end.
Don't the Supra guys use copper plugs, and replace them often?