The 520 Sea Rays that were built were all Zeus pods with Cummins. There was a straight shaft with MANs version being developed but it never made it to production.
I was involved in the project start to finish. There were two different sets of engines installed. The first set had twin turbos with no water jackets around the exhaust housings. That set had some overheating issues. The second set had the turbos with water jackets as shown in the pics on...
That boat was built at the Palm Coast Plant. It was built as a power blank and the Plant engineering team did the stringer mods and engine installation. I spent a few months on that project. The engines were imported by Perkins and were being tested for use in the larger yachts being designed...