Emaxx motor setup question

[lincpimp]

Looking at getting my 2wd emaxx back on the road and was wondering what everyone thought of the following setup. The emaxx is completely stock save for diff and driveshaft upgrades and a gmaxx single speed. I have a feigao 15l and a bk 9920 laying around. Would that setup work well on 6s 4200mah 20c lipos? Total motor speed would be around 36k rpm. I would gear for around 40mph as usual. The truck is very light and all I do is bash!