If you are a 50's and 60's Merc expert the picture on page viii is a very good puzzle. Look closely at the side emblem on that motor and you see: "Turbo Hydro Four".....the Merc designation for the 30 cubic inch motor. Supposedly Merc only made 298 of the Mark30H racing motor back in 1956. But this motor has the "square" top cowl and the stamped aluminum front cover that began in 1959. It also has the black/striped wrap around cover that would be correct for 1962.
Here is the answer: apparently there was a 1962 batch of Mark30H racing motors as well. As yet no one has come up with any documentation of the availabilty and sale of them from that era. One little clue we have is that these motors are pretty rare, I only know of 5 or 6 of them in existance.
The little that there is regarding the 1962 30H's also indicates a third batch of Mark55H 40 cubic inch racing motors also made in 1962. A few of them also seem to be in circulation, but experts had ignored the possibility of them being 1962's because a batch of 55H's had been made in 1959, probably with the same cowling.
Regarding the Dockbuster rotation: Don't sit up too late pondering it: The came in both right and left.....I can give you the part numbers for both rotation set ups.
Switzer Wing Steering: Dual Ride Guide...a separate cable from the steeting rack for each engine. This was a normal dual engine accessory available from the factory (but it would have only been used on a deluxe cabin cruiser or race boat with dual engines; customers considered it quite expensive back then)....I've never seen tie bars on a picture of a Wing, but tie bars go back to the 1930's on dual engine racing outboards