I bought an 04 armada vin the vin A with the engine knocking. I know the 04 to mid 06 came in flex fuel and unleaded. Mine is unleaded but have been offered a very low mileage 06 titan flex fuel engine for cheap. Now just to make sure I'm on the right page, the long blocks are identical minus the fuel rail, and injectors correct? I'm not looking to run flex at all, just want to know if I can use this long block without much swapping parts around.