What you're describing sounds like the 21 foot Nova that Wellcraft built
for a few years. It was a downsized version of the more successfull 25
ft. Nova with twin Mercruiser engines. A friend had the 25 footer,
then later tried the 21 ft. Nova. The 21 was a good boat, but didn't
come close to performing like its bigger brother, the 25 ft. If it has
a Scarab logo on it, it was probably put added by a previous owner.