Those figures are Horsepower at the Crank, the TRUE HP measurement is at the Rear wheels on a Dyno!
Cobras with IRS are gonna have close to a 15% driveline loss!
And FYI that 320 figure was a bear for Ford to reach, it resulted in a recall where the ECU was reflashed and the intake was machined! The way to find out if your car had this work done
is to check the top middle of the alternator, there will be a line of paint on it! 
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