it will fit, it's physically the same size as the 5.7. Reason most do the 5.7 and not the 6.1 is they cost an arm and a leg more for one!
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5.9 magnum ---------------- Dana 60 Swap in Progress! ------ Shift Kit -------- straight piped exhaust, with no Cat ------- Clear Lights ----------------- Accel Super Stock Coil Wires ----- K & N Drop in Filter -------- Soon to be sitting on 38's with 5.38 gears!