Ok I have searched alot of threads with no definitive results about the 4.0 conversion. Mostly 3.9's. I have a 97 that I wanting to convert to 4.6. I already have the crank, pistons and rods. Can I just change out those and be fine with the 4.0 ECU. Read it might run lean using the 4.0 ECU. or does something else need to be done? Also should use the stock 4.6 cam or go aftermarket? Also will this work in my truck Land Rover ERR7109 ECU Engine Control Unit 1998 HSE 4.6 ?