Agree with fnq cairns, they re a good motor. Take it for a run and check the comps, if both are ok you should do well, at least you will know what you've got. If you sell it and get another its always a risk. Then there's the hassle of doing the change over which I've just spent a very long weekend doing on my boat.

Watching ebay will give you an idea of the going prices, my old yami is there now.