1997 Ford Mustang spark plugs

Usually new plugs come with some already on the threads, but in any case remove them cold and it should be OK do it now, 2000-3000 miles isnt that much, so I dont think anything is wrong yet.

Hello _
merlin2021 is right,do not worry about it.
A standard set of spark plugs usually requires replacement after about 20,000-30,000 miles.
by the way the spark plug (for any aluminum head ) for cobra has plug shell made of a nickel alloy if you use your vehicle information when you bought them.(do not use antiseize on nickel) so you did the right thing. because it acts like a lubricant and may allow too much torque to be applied to the plugs, damaging the treads in the cylinder head.

For future use only :
With torque wrench 18 to 22 ft.lbs. in aluminum heads .
When changing spark plugs, wait until the engine has cooled to remove the plugs.
right now you're good.