Saw the strokers @ sema a couple weeks ago and picked up the spec sheet. The 400 hp versions are inboard right now. The rep said they were doing some testing for i/o. They did have the 350 crankshaft hp available as engine only , engine with bravo1 , bravo 3 , and trans for inboard. They are set up for 87 octane. The best was 1 year fact warranty and 2 year additional extended available !!! The poster on the display said " run them all day long @ wot " , I had to question that. The guy I talked to has them in his boat and swears they have been awesome. Good luck with the project , I'm waiting to see how you make out!!!!!!!