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People post cams for sale on m1r all the time for 3-500 below retail. I'd say for the price of aftermarket, which unfortunately require full exhaust and intake mods to get most out of, you can get full exhaust, kooks of course, with 98 cobra intake cams($150) advanced 4 degrees.
I have 98 cobra cams sitting in my living room but have been holding off on the install. I've seen some dyno sheets where people installed cobra cams and aren't producing much torque or have lost torque. If I'm going to go through all the trouble of having them degreed I'd rather go with something after market like the comp cams or ford racing. I've seen good gains with the cobra cams but it usually is with a short runner intake. At this point, I'm thinking wheels and tires. It will improve the look and traction. My car wants to blow these 245/45/17's right off the wheels. As soon as I hit 2nd I have to back off the throttle to gain traction and I even feel the car kick out slightly when going from 3rd to 4th at WOT. The BFG G-force KDW's are what I run and they are much stickier than the stock goodyears but still don't quite cut it.