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 !
Hey Marty, join the crowd, these cams have basically "not been available" for many years, although there seems to be one every now and then popping up new in the box, they are basically "gone". Therefore the best and effectively "only" source is the engine rebuilding market where people have obtained a RR motor and want to make it run the different direction for automotive use. To those guys the RR cam is worthless but to us it is something of value. In the end if the RR cams on the recycle market get too scarce, we can always just run with two motors spinning in the same (automotive) direction, as it works and even Chris Craft built several models like this.
As you undoubtedly know, the crankshafts don't really know or care which way they spin, except some have the embossed wiper dimples at the main seal intended to help "wipe" oil back into the motor and if you have one of those and reverse the rotation without polishing it out, then the motor will be a real leaker because it is essentially trying to wipe oil out of the seal. The water pumps are directional specific so they would have to be changed, and of course the cam and distributor gears are different too, but other than that it is not all that hard to convert a RR (Reverse Rotation/Right Hand) motor to run in the standard automotive (LH) direction.
My advice is to search the marine recycle market, that is where I would go to find one.