I use a 1979 Chevy Nova. The ratio is 2.73 and I run an s10 5-speed Has good acceleration and I cruise at 2000 rpm at highway speeds. Don't know which ratio your tranny has in 5th gear, but with a 28" diameter tire and a 2.73:1 rear gear your 2000 RPM would be going down the highway at 90 MPH if 5th gear is a 0.68 OD or 77 MPH if a 0.79 ratio 5th gear. Taller tires (likely) would increase these impressive "highway speeds".
'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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