Head over to ModularFords and search their 03/04 Cobra forum. There used to be a few clips of cammed 4v's floating around. A cam swap in a 4v is very expensive and not something most weekend wrench's will undertake in their personal garage. Unless you plan on upping the boost to 20psi or so and racing your Cobra regularly cams may be a little much... plenty of 03/04's with stock cams are making 600+ RWHP. There's a great running thread over at that same website about the Crower cams and the problems some are having with them. If you really want to talk cams I suggest you head over there and post your questions.