C36 to Hawaii
It was done as recently as this summer. Lady Liberty, a 1987 Catalina 36 from Oxnard raced the 2007 Transpac. As a side note, I would think that it is a very safe bet that there are more Santa Cruz's (and N/M's, and Andrews, and J's) crossing oceans every year than BCC's or Westsails. They also return from their various ocean passages against the trades, remember. A full keel, attached rudder, bulwarks, etc., etc. are hardly the absolute necessity some seem to propose. Also, remember that racers can't wait out bad weather and have to sail no matter what they may encounter.