HDH ran as an UGF and as a TAF. This was over several years with different drivers starting with Mike Brendel and ending with Sonny Jones, early 70's through late 70's. I followed the races as a teenager and Irv Brendel let me work the pits while they campaigned the TAF with Sonny Jones at the helm. Soon after we moved up to TFH and Smoke on the Water and no longer ran the TAF class. I want to say this was after winning the Ray Caselli Classic in Oakland around 1976?? Was there more than one hull? Contact Dean Staberg from 3D Boats, he would know. As I recall he drove the HDH for a time.