I pulled a set of vortec heads off of my 1996 k1500 vortec 350. I plan to use them in a moderate build of a different 350 that will be getting edelbrock performer rpm intake and carb. I'd like to throw a cam in it too, and I heard that vortec heads have some restrictions as to the lift they can handle. I don't want to machine the heads, or buy new ones, simply because I don't have the money to. So, with that being said, what kind of lift/duration should be safe to run? Im hoping to at least go 1hp per ci. Thanks!