Willing to swap 383 for slant six

My buddy moved to ARK and gave me his 75 Dodge Monaco motor home.
He had the 360 rebuilt and kicked up to a 383. He said it has , tops 40k
on it. I started it up last summer and she sounds strong. My 225 is a lil tired
and looking for a replacement to run with and havent got all the facts on
the 66 I have to think about rebuilding. Thanks John:D