HotRods are fun. They are what GT12 was intended to be but never was
You will just need a 1S esc. This will allow your servo and reciever to work properly. Most places limit the servo spec as well, so you will not really suffer from any brown outs. However if you do run a Savox I would use a power cap to help compensate for and unexpected dip in power.
Check you local club rules and see what they recommend.