Weber tuning frustration

I've owned my Pantera for 39 years and every year or two I strap on my original Webers, but after a few months of struggling I go back to the trusty Holly. I cant seem to get them balanced. With all settings the same one side of the exhaust runs cold the other side hot. without going into things I've tried to alleviate the problem, do you have suggestions?
I dismantled and cleaned all carbs.

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