We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common ! Just start by posting a note introducing yourself to the group, that's all it takes here (we don't ask for or retain any personal information here, because our intention is to just "have fun and share information".
Do you still have the original Ford engine or access to it?
It would be easy to determine the rotation of it by looking at the timing tab or hooking battery cables to the starter and turning it over. I am guessing since you have a left hand prop, then you had a left hand Ford 351 and you will then need a left hand SBC to replace it. Is the tranny original or was it changed out with the rebuilt Chevy engine. You know the bellhousings are different, so what was done about that?