Even with 28" tires, that 5.13 gear has your 270 turning 2200 RPM at 35 mph. Rated horsepower is around 3400 rpm which would be screaming down the road at 55 mph.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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