If you plan on keeping your present engine combo and don't want to make it a garage queen, 355's would be the most gear I would consider. For a long time I ran 3.90's in my 68, but that was with a RA4 style cam.Interstate or highway driving was annoying with 26" tall tires and high RPM's. I now have 3.42's with a smaller cam and the car is a pleasure to drive once again. 3.55's will get your 68 accellerating alot better than those 2.93's
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