1966 225 slant 6 Motor

I'm looking for a 1966 slant 6 225 good running motor to use in a 1966 Plymouth that I'm working on.It must be a 66 with the numbers on the deck flat behinf the coil starting with the letter B 225xxxxxxxx .I'm in the New York metro area and can travel in a 500 mile radius for this. .