I found this:
A bold new star joins the Glasspar Class of '74 . . . the Don Twenty. No ordinary boat, the special lines, the outstanding performance, stem from the fact the designer is Don Aronow of Cigarette Racing Boat fame. A triple threat boat . . . a proved racer, an ideal runabout and certainly the sportiest ski boat on any body of water.
Gunwale Length: 20'4"
Centerline Length: 19'7"
Maximum beam: 73"
Cockpit depth: 2'1"
Weight I/O: 2598 lbs. w/275 Chrysler
B.I.A. load capacity rating I/O: 994 lbs.
Bottom Contour: Deep-V