There are so many questions at this point, that I would think anyone who recommended you a cam would be out of their mind in a way besides something production like a Z06 cam. First off, there are a few things that come into play when choosing a cam. Gear ratio, M6 vs A4, and stall speed if auto all come to mind and that includes the assumption the engine's otherwise stock. Bigger engine mods like headers, full exhaust porting etc. also change a cam choice. For anyone to make a recommendation professionally they're going to want this and possibly more info. Besides that I'd probably try to find a couple people with cammed LS engines of the same CID and trans type and see how they act. Don't forget a tune may be required to make it behave well.