Max speed attainable at 7k and stock 24.5" tires is a hair below 169mph...
However the 200HP SVT is drag limited to 143-144mph...
150mph at ~240HP (~195FWHP)
160mph at ~290HP (~240FWHP)
170mph at ~340HP (~275FWHP)
(rough estimates)
Also like stated before. The stock speedo is quite generous once you get above 100mph.
Deviation from stock tire size will make this exponentially worse.