Rob, did the hogged out mani really pep it up or was it installed in conjunction with the 2.5 head pipe? Curious to what just the 2.25 super six head pipe on a bone stock 1.9x ish outlet would accomplish on a stock build. Only thing I'd do is an Oregon cam ground to "RV" torque specs along with that carb and maybe a 2.93 or 3.x rear.