As far as the value of foxbody 5.0's going up in value, I do believe they are. I do see owners asking for more and more money when I see them for sale. I am, however, skeptical of how much they actually sell for (if they sell at all). The Foxbody's for sale are also becoming nicer now that more people are building them up and sinking some decent money into them which is increasing the value. More and more people are looking for a Fox to begin their build so the lower mileage, close to stock type cars are going up in value too. If somebody owns a sub 100k mile, original V8 5.0, 5 spd Mustang then they are sitting on an appreciating asset IMO.