That boat looks somewhat similar (can't see the bottom, so can't be sure) to a boat built by Bill and Ralph in the late 60's or early 70's as a C Service Hydro. It was a tunnel boat completely, and was brought to Kansas City for the Leavendusky's (Butch and Stan Sr.) to test. I helped them test it on the Missouri River north of Kansas City, Ks. I don't remember the exact results, but I don't believe it was as fast as the Marchetti Hydro they were running at the time that set many records and won many Championships, including National (APBA) and World (NOA) titles.

I think they still lived in California then and were on the way thru from the west coast headed somewhere else. Maybe Tim can ask. I am curious what happened to that boat and whether anyone ever had any success with it.