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Just out of curiosity, can you get in touch with the po. Just to make sure he didn't stick money into the stock intake with porting the upper and lower. They're some over at the corral forum making decent power thru them.
I haven't been able to get ahold of him, but i remember him telling me that the intake and heads were fine.. not sure if he meant "fine" as in it works or if they have been ported.
I've had a buddy pull some decent numbers with a ported manifold.
Still I'd really like to get an aggressive cam, AFR heads, and a new manifold.