[MrE]

My old 73 was 33' with a 4 stroke normally aspirated (no turbo) Cat 1160 and 4spd Allison. Most of the older 4 stroke Newells were either Cat 1160s or 3208s (V8s) or Cummins 555s or 903s ( V8s) with 4 or 5spd Allisons. I believe there was series 60 Detroits available from the factory in 94, but pretty much standard in 95. If you’re looking for a I6 4 stroke with a 6 speed transmission Newell under 41 foot it’s going to be a re-power.