Yeah that has been known for a while as the "tick". A few months ago some New Jersey owners had the new heads replaced and from what I have read haven't had any problems with the new ones.
The only problem I would have as a 03 Cobra owner would be that the engine was hand assembled by specially trained techs and the replacement heads are done at the dealership level.
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"I'm in the 82nd Airborne and this is as far as the bastards are going!"
93 Cobra, R302 331,canfields,T-76,TKO......sold
87 Coupe, 466, Edelbrock heads,Vic jr,150 shot 10.41@129.5...sold
2006 Honda 450ER .....new toy
Do you own a Torch Red FRC and tremble every time you drive under I75 on Hwy 60 and look in your rearview mirror? If so you are suffering from what is known as Cobraphobia.