You're probably not going to have much luck with that stuff. Some people use a 17T motor on 8-cells and seem to like it but the best brushed motors I've used were 13-15 turn mod motors. My favorite was a 15T/S mod motor. Long since, I've upgraded to brushless and can't imagine ever going back.
The weight and size of an RC car ESC will be detrimental and any kind of ESC braking will not be compatible with heli flight as braking can only be associated with crashing...
As for the number of cells, that will depend on you motor. I prefer 7-cell packs because they're lighter and a good match to my brushless motor.