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 !
Here's the general idea. A length of inexpensive corrugated drain pipe and a couple snap ties. Bingo.
Fast, inexpensive, and effective. I ran the motor on water until it warmed up and just discharged that water out onto the ground. Then I started the final fill with three gallons of water, as the water began to draw down, then I added three gallons of antifreeze to the supply container. That put an initial full strength antifreeze mix through the motor. I collected the mix from the discharge containers and ran it back through the motor two more times just to be sure I had all those fresh water pockets flushed out.
I now have a 6-gal storage container full of antifreeze mix for the next time I need to do this, which I hope will be sometime soon. I'll run a long intake hose all the way back to the container next time, so I can run the system continually until I'm satisfied I have all the raw water flushed out.
The boat is ready to go to the marina, or to withstand freezing temps, whichever the case may be.