Lots of opinions expressed and I enjoy seeing them. Me? I restored my '51 3/4 ton. Had the engine rebuilt even keeping the babbit bearings. THEN I started tinkering. All the tinkering I do can go back. I first swapped out the 4:57 rear for a 4:11. The ol 216 pulls me along at 55. Yes, the RPMS are high but the engine doesn't seem to mind. BTW, if it was a 235 the RPMS are just as high. to get the same speed, the engine has to run at the same speed. then I converted to 12 volts only so I could put in HEI ignition. My current project is upgrading the Huck Brakes to Bendix.