id go with that 1 it will be a tad slower than 50mph on 4 cells but you will still have to watch heat build up in motor on 3 cells 2 should run way cooler when geared correctly
id go with the 3300kv its a little more friendly to 3 cells . you will still have to limit run time to less than half of a 2 cell..
Amazon.com: Xiangtat Hobby Wing EZRUN Max10 60A ESC Combo with EZRUN G2 3652SL 3300KV Brushless Motor : Toys & Games
4000kv on 3 cell will be a cook fest ull burn...