Re: Shaft conversion
You will be cheaper off finding a short model, or a short donor motor with a blown power head. The cost of the driveshaft, water pipe, and shift linkage (if a B model) will be close to the cost of the whole motor.
Modifying the transom jack height may be another option... but keep in mind that many dinghy transoms are already low even for a short motor. In my case, with a Walker Bay 8' dinghy (actually the WB 275 RID -- tube accessory added), a short motor needs almost 2" of extra transom height. If I were to try a long shaft motor, that would be almost 7" to raise the motor. Quite a job on my boat!