I'd be looking to use 5" of backspacing for the 8" wide wheel in the rear, 4.75" at the very minimum.
A wheel with only 4.5" of backspacing is cutting it way too close, personally I think it would surely cause the tires to rub.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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