Will, in the front I'm using a spacer/adapter that is 1.063" thick, effectively reducing the wheel backspacing to right about 5.5" from the true 6.57" wheel measurement.
The 6.57" (not 6.75") backspacing works perfectly as-is for the rear and allows me to use 5 of the same size wheels. I really have no choice other than to have a full-size spare in the trunk because of the brakes, but with the big A-body trunk it fits easily.
Bart
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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