Going to the Cobra/Bullit rears a worthwhile upgrade, caliper the same, pads/rotors/anti-moan bracket/axle bracket are different, links in your other posts & pics of mine. The Cobra/Mach I/Bullitt front calipers are fine for everything but all-out track car.
I like the stock brakes a lot. If you have them in good shape they are more than suficient for every day use. Plus for me it was necessary to keep them because of the 16" snow tires.
Now, if you would take your stang and go "road course racing", the brakes would definitely not be sufficient any more.
The only upgrade in my opinion is the cobra brake kit. It is cheap and proven to last. But that's only my opinion.
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