I mounted mine a little bit more forward then TC3nut (from the look of his pic)
What I did was to line up my TC3 Chassis with my NTC3 chassis, I then bolted the NTC3 chassis to the TC3 chassis via the 4 front transmision holes. This provides the nitro chassis as the perfect template. I wanted to have the bellcranks in the same posistion as the Nitro car. This way its lined up in relation to the center of the front arms (pivot point) I figure its a starting point...
I am working on pics. to show you guys.

Hope this helps.
Korgae