If you want a 250, you might want to wait until you find one. It will probably be less expensive than buying a 230 and the 250 components. If no one close to you on this board has a 250, you might put a wanted ad on Steve's Nova website saying you want to purchase a good running 74 or earlier 250 within X miles of your home. There are many on that site that replacing their inlines and would love someone to haul off their old motor.
