Ski Jet was actually two classes back in the 70-early 80's. I raced in Ski-Jet II which was a 460 CU limited class where you could run angle valve heads (BBC and Hemi) Ski-Jet I was for wedge head motors Olds was the primary motor. All iron blocks single 750 carb, and marine exhaust (over the transom was typical). No headers,
two seats, off center steering, through the deck fueling, no adjustable nozzles. Classes were run in drags and circles. we also had powder-puff heats for the ladies.