with one of BrianG's most recent updates, the list of top speeds with all the pinions will show you the gear needed for the 1:1 rollout, which is a nice starting point. Also, BrianG if you see this, thank you so much for the import/export values functions! I end up using your calculator like 3+ times a day. you rock!
you need more motor then a 36-50 for an esavage...
expect temps to be high
I had my medusa 36-50-3300kv in my E-savage and my temps never got above 140 on the ESC or motor, I was also running 21/66. That motor has no problem pushing an E-savage, The E-savage is smaller than an E-maxx