Was it an off the shelf comp cam, or a cam that comp cams ground for ed Curtis? I'm pretty sure comp cams grinds all of ed curtis' custom cams, but they're not off the shelf. They're tailored to your wants.
Custom cams are not just about getting a custom cam ground, you are getting the assurance that your heads, cam, and intake all flow together. They will all have the same powerband, and flow rates that work well together, not just random slapped together pieces.
Screw it all, just get a donkey dick cam(gm term)