Approx 8 years ago I replaced my stock 98 GT engine with a 4.6 stroker. Nothing special other than adding Ford Racing intake manifold, Ford Racing PI heads, and cam. Additions are 40 lb injectors, and a Vortech v2 Supercharger with a T-rex fuel pump and removed all cats and replaced with Ford Racing shorty headers and Flowmaster exhaust system. My problem is that since day one dyno testing only produced a max of 356 HP. Engine runs great otherwise with less than 7K miles. Any ideas as to why the HP is so low? Shouldn't it be higher?