I am trying to swap out my stock 3.1L for a 3.9L from a g6. My two options are to use the stock OBD1 system or to use the wiring and ecm that came with the new engine and then retain the vvt functionality. If I use the newer ecm what would I need to make it work? Can I disable bcm functions and just use a g6 gauge cluster and wiring? Any insite would be greatly appreciated!