Likely the greatest bargain is the '87-'93 Mustang GT or 5.0. You can get into one for chump change because there are so many available on the used-car market. It's another example of the law of supply and demand. If you're sprucing up a Fox-body Mustang, there are all kinds of modifications that will make it stand out. White-face instruments are one way to get there-and for not much money, either. We'll show you how.