Tire issues are always difficult to figure out and very subjective. It appears to me that the amount of weight added is a bit excessive as the old rule of thumb for aircraft tire is no more that 1 ounce per inch of wheel radius and the pix looks like more that 7 1/2 ounces on that wheel, but I could be wrong.
I went with Diamond Back redline on Cooper radials, but then, the raised white letter look was something I wasn't after on my 66.
Good luck on figuring this out.
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