The NTC3 is a shaft driven car, so that means it is a 1:1 drive ratio front to rear. When running that, I always ran the same shore front and rear. i would start with 38 jaco tires all around and get a set of 40's in case you may need them. When running the NTC3, try running a small split of about 1mm smaller tire in the front.
Am I going back racing?...Hmmm.. Not anytime soon... But soon enough.