Depending on what you want to save on putting this engine in, you could use an A6[si or ex] IM , fuel rail and so forth and use a PM6 ecu. Basically just bolt your A6 IM up to the Y8 motor And you can still use your A6 dizzy, It bolts right up no problem. You then can use an MSD rpm switch to activate your VTEC. Some people don't like to do this. I know it works.
You don't hafto convert it to obd-1 to activate your vtec.