1998 Mustang SVT Cobra speed????????
mid 12's is about right for a mustang with this power - depending on tires & driver.
0-60 is again subject to driver abilities, tires and overall set up....but expect it should be well under 5
the 03/04 terminator series cobras (factory supercharged, 6 sp. narrow gate transmission) were rated at around 400HP and run 0-60 in well under 5, do the 1/4 in 12.9 (stock).
i would only purchase this car based on a full mechanical ck by a pro shop (compression test, review of the supercharger installation, brakes, suspension, etc).
i assume the car also has an aftermarket clutch and bigger rear end gears.
if the car has been properly set up, and has been pro tuned post supercharger installation i would think in the range of $12,000 would be reasonable price....if all cks out ok. it would likely be worth more if it had a better supercharger installation - modified twin screw design like a kenne bell or whipple (they are more expensive but deliver power earlier & in more linear fashion)
cheers 04 cobra (2.3 whipple blower @ 15lbs, 60lb injectors, BAP, fuel rails, MAFia, magnaflow exhaust system, some other stuff, pro tuned to run on 94 octane - measured at 575rwHP on dyno)