you will need a bb exhaust adaptor to run a true bb pipe , hit up @racer1966 ,he makes them and they are the shiz. honestly I have the same engine but using a trinty clone pipe and I haven't upgraded anything,i did do the 2.5 brake disc mod for the slipper but other than that its sweet. only failure after 20 tank was the pin on the primary input shaft snapped . I would look at the truck and see if anything need upgrading , like if the driveshafts have wear ect .
also best plug I have found for that engine is McCoy mc8/mc59 but the trx plug and os lc series will also work.
I tired to keep it around 220F ,I used a slightly modified traxxas break in where I idled through the first 2 tanks then basically doubled the 5 tank break in and that worked great fro me.
in regards to wot ,you will have to loosen the pinch bolt for the carb and rotate the carb until it wots ,if you have the later model trx radio with the ipod dock you can adjust the endpoints to make the throttle open further.