I recently sold a `76 Sprint Jet. From what I understand the Sprint's are flatter on the bottom than the Supers. The Sprint's look kind of like a GullWing on the exit of the hull. I think they also ride a bit ruffer than the Super's. They're quite a bit tighter in the engine area, as the gunnels wrap way up and over. I was told the Sprint is 10mph faster than an exactly equipped Super, but I couldn't verify that personally. My old Sprint had a low comprssion 460, OT's, 750 vacuum secondary Holley, MSD ignition, droop snoot, loader grate, and a nice ride plate. It ran in the low to mid 70's all day long at 5300-5400 rpm's.