It would probably be cheaper to find an NA chassis. they dont have Hicas(but you probably wouldnt want it anyway). The NA rear end has better acceleration with the 4.11 gear but the pinion shaft is smaller than the TT and has has been breaking on people with 400+rwhp. So either way it would be best to put a better rear end on it anyway. That said, the lightest is the slicktop NA and If you dont mind not having T-tops that would be the best one to go for.