Body is different, interior is different, I believ the mach has a forged crank if you're getting it manual.
^Yup
I think the Mach's had a tad more torque than the 99 Cobra's, yet Cobra's had a bit more HP. Here is more of what I know stock Mach's have...
305HP @ 6000RPM
320ft lb @ 4250RPM
10.1.1 compression
4.6L DOHC Aluminum WAP block (Windsor aluminum plant)
TR3650 manual tranny w/Gear Ratios 1st - 3.38; 2nd - 2.00; 3rd - 1.32; 4th - 1.00; 5th - 0.62; Rev. - 3.38
Forged crank w/6800RPM redline (manual Mach's)
3.55 gears
Subframe connectors
1/2" lower than stock GT
Springs - Front 600lb, Back 250lb
Tokico shocks and modified struts
Brembo 13" front, 11.7" back
Curb Weight 3465 lbs. (manual) 3475 lbs. (automatic)
That is a pretty low price, but you never know. It's always worth a look. Selling your Mach too? I'm dizzy... think I'm gonna faint

Lol, j/k