you have to alter the steering on the radio because the steering plate is much lower than before. also the long turnbuckle that goes from the servo to the steering linkage must be lengthened.
As far as tweak in the chassis, i made sure i built everything up together, but not tight, i placed the rear bulkheads on a flat table before attaching to the chassis. this ensured they were screwed together on a flat surface thus reducing the amount of tweak in the car. this can be a problem if not done correctly as the rear bulkhead has a number of peices to it.
my first heat with the car wasn't good as i hadn't adjusted the radio, but once i did, the rest of the day was awesome. i used the exact same setup from the ms and it was faster, easier to drive and alot smoother. i think having all new bits helped as well, along with the bling factor!!!