Taking out a Borg Warner Velvet Drive transmission from a Tartan 37 sailboat

The transmission on my 1969 Tartan 37 sailboat has finally met it's match. The oil cooler busted, and leaked water into the transmission. I had to remover the transmission by myself, and by using lines, blocks and winches managed to inch it out. The transmission is a Borg Warner Velvet Drive, but not sure if it is the original one that came with the Westerbeke 4-107, which is still going strong.