I inherited a mustang from my uncle recently. In the 90s he dropped a 200 cubic inch 1966 engine in along with a 1966 transmission into the car, replacing the stock 170 engine. I have been wondering if when I got to sell the car if this will hurt me as far as car class goes. I would like to know if the cars value goes down to around 7 grand or if it would stay at about 22 grand. This will make a big difference on whether or not I do a complete restoration. Please help me out. Thank you so much!

 

This is like spearing fish in a barrel. There will always by a buyer around who loves the car being sold, regardless of changes from original, even happens among "collectors". There is a huge market for original Mustangs.