It would be worth more with the orginal AMPS motor installed vs the stern drive.. RCollector would be most likely your best bet to suggest what it may be worth. As already mentioned, pics are worth a thousand words.
Then again, it's worth as much as someone is willing to pay.. I have a few AMPS boats / motors that will never be sold.. But then again, if someone came up with the right amount of $$, I might be interested..
Two that won't be sold:
AMPS tunnel (from when AMPS was still in England) with a Fox .60 powerhead..
AMPS T4 motor with a Fox .40 powerhead:
I have been told that the Fox .60 motor had less then 10 made by someone that worked with Mr. Agnew after he came to the states. Tony, the current owner of IH, along with the other gent have never heard or seen the Fox .40 motor.. This leads me to believe that both are very rare motors.