Sceptre/Tsunami Before SCI (1972 - 1980)
Fuel Tank for the 342 Outboard models = 100gallon
Fuel Tank for the 383 I/O and the 26 inboard models = 72 gallons.
SCI removed the well and changed the deck (I think 1981/82)
Fuel tank for outboard models =144gallons
1982 catalog (picture above) does not show an I/O or inboard option available.
Bgreene - Maybe there's a old barn find hull for you at the old SCI address
https://www.google.com/maps/@27.8701...7i13312!8i6656