M96 3.4 Engines

[Lightning]

I am in the process of looking at a 3.4L conversion for an '01S. I'm sticking to '99 to '01 Carrera engines because I want to retain the stock Motronic 7.2 ECU (this is for a modified street car which is frequently driven on the track, and will also have to pass smog).

I'm currently looking at a '99 engine with 35k and an '01 engine with 65k and was wondering if the sages of cyberspace might weigh in on such a choice. (I've already decided that either way, the engine will get a 997 RMS, an IMS upgrade, an X-51 oil pan, and an Accusump, as the car sees at least 1.2g's in cornering and braking).