The fly by wire throttle is no problem to set up as long as you have matched year group components for the system. The throttle body, TAC module and throttle pedal must match. Things changed from 2002 to 2003 and you can't interchange across those years.

As to the engine mounts, I purchased off the shelf units from Early Classic, lot's of people use S&P style mounts or knockoffs available on Ebay. My oil pan is no more than 1 inch above the crossmember at the rear.