They're a little more optimised for higher flow and have the overlap specs to work well with forced induction. Whether they're worth it really depends on what you're trying to do and how many improvements you need to make. For a regular street car build with moderate power, I'd just say forget the cams. If you need extra power, turn the boost up a tiny bit. If you're looking for a big power build, then you could consider cams so that wouldn't get in the way of your efforts.

Anyway, there's no reason you can't make good power on stock cams, so I'd recommend getting everything else that you need if you're putting together a turbo kit for the street. Basically, spend the money you need on the turbo kit, and get the cams later. Spending money on the cams and not getting the proper turbo system parts is far worse than just using the stock cams, if that makes any sense. Cams are pretty easy to install and you can add them at any time should you so desire, so worry about them later if you're on a budget. Or, don't worry about them at all and stick to the stockers like most people do.