It depends on what engines and drives were fitted then.
It started life with Sage drives and Torque V12 engines, then Arnesons and Yanmar 480s then Seateks. and god knows what in between.
The boat had numerous alterations made to the transom and rear end over the years.

I see your dad got the Skater in the water for the Poker Run hows it running with the 400s on it?