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SignUp Now!For the price difference between the two, i would go with the Champion Aluminums. Best bang for your buck.
A good set of ported irons will get you into the low tens if not faster. How fast do you need to go? Aluminum heads are prone to cracking, at least one brand of them is. TA and GN1 both need roller rockers. You "should" run roller rockers with a roller cam anyway, but not required.