basic 4200 amps?

im running a basic 4200 in my rustler. i wanted to know if anyone has done tests to see how many amps it will draw on average including burst amperage. the reason i ask is i have 2 polyquest 3s4400 packs and was curious if it was safe to run it on one pack. one pack is capable of roughly 53 continuous amps but i would think thats borderline. i dont intend to run it often with one pack just occasionaly if i want a speed run. i would appreciate any info you may have on this. thanks.