We used to run the 235/60 and 245/60 combo on this car and it looked great, but the 245s did come a little close to the wheel lips. Might be because we're running a slightly wider (1" overall) 2nd-gen 3.42 posi rear in the car with the spring perches moved inboard to make it fit. When we bought tires the next time we decided to use the same size all around, this allows us to rotate the tires too.
You won't have that rear clearance problem with your '68, I wouldn't hesitate to go 255/60 in the rear.
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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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