Judy & I ran many T & D rallies in the old days, and had quite a few conversations with radar police. 26-1/2" dia. tires allow the speedometer to be awfully close to perfect with a stock ZF. If this isn't a major concern, and your Pantera engine is healthy, a bigger diameter tire will simply raise your gear ratio slightly, increasing fuel mileage and top speed a little at the same rpms you now use. Just be careful in front to not go too big or you'll have massive, expensive interference with sheet metal. The rears are normally OK for clearance with all but tractor-sized tires.
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