There's no single answer to how much Ford cars cost in 1998. The price varied drastically depending on the *model* of Ford car (e.g., Escort, Taurus, Mustang, Explorer, etc.), the *trim level* (e.g., base, LX, GLX, etc.), any *optional features* added, and the *dealer*.
To get a price range, you'd need to specify the model and trim level. You could then try searching online resources like archived car magazines, used car pricing guides from 1998 (like Kelley Blue Book archives if available), or online forums dedicated to classic cars.