Stealths are going to flow more than a mildly tweaked set of 906's. I agree with swingin, your combo is too mild to benefit much from the stealths. I would leave your heads bone stock for now, don't invest anything into them. Then later on down the road if you choose to step up to more cam like the 60304, rpm intake, 850 carb, add a set of headers, then you'll be able to put the extra flow of aftermarket heads to use.