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I sure would have thought a 428 CJ would have put down more than that. I know if you still have the sidepipes from Lonestar,they're choking your engine to death. Those pipes are for a small block. You mentioned new sidepipes, make sure they are 2" befor the collectors. Also, I would remove your headers and match the exaust ports and port the other end at the flanges,(sometimes they have sloppy welds that restrict flow). I was also wondering if you have aluminum heads and intake, that would help alot.
My .02, Tim
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