I'm not sure we need a whole lot more information. $10K is too much. When I was searching for mine I saw quite a few with galvanized frames, petrol motors in the 5-7 range. A few real nice ones around $9K. I got mine for 3.5K and it was running fine, just not historically accurate.
So basically what I'm saying is you should be paying between 5-10K, otherwise walk and keep looking. One will pop up with a better engine for less.