You have to know what you're doing to find cam lobes that take advantage of the larger Mopar diameter. The generic cams use Chevy lobes. Even the Mopar Performance cams used Ford lobes rather than Mopar lobes. Comp has lobes ground for the larger Mopar lifter but most of their shelf cams use a generic lobe. Hughes Engines sells Mopar lobe cams. I've used the MM lobes from Comp before and they are a bit radical. I doubt I'd use a MM lobe cam in a street car but it could be a decent choice for a race car. Of course, as Brad pointed out, faster isn't always better. In fact, I've proven multiple times that you can lift the valve too fast. Lifting the valve too fast can cost you power and it will also wear out parts.