Here's one I built back in about 1980...
XKE V-12 with six Weber 44IDFs, baffled zoomies, MSD7, hot cams, HC pistons, in a Nordic 21' tunnel picklefork hull. All the marine hardware was hand built.
The jet drive was the weak link, as it prevented the motor from getting up to an RPM where it could really shine.
Sure turned heads though, and sounded like a P-51.