Any motor, in my opinion, is worth playing around with and especially if it is in as nice condition as you describe. If the motor is tight, it may be just from sitting and a good soaking of the pistons and cylinders with your favorite penetrating oil may be all it needs to free it up again. If it has points ignition, they will need cleaning as will the fuel system. A new impeller would be a good idea to.
A Mercury dealer would be your first place to try for parts as they took over Chrysler. (Force)
