Gearing again !!!

I´m not sure whta size pinion and spur to but together in my E-Revo - hoping for some help :002:

It will be driving a Quark 125B and Feigao 540c 7xl - 2x7 cell/2x 2s2p 8000 mah lipo. stock diff.

I have these spur gears to choose from right now 66 T, 70 T, 72 T, 74 T and 76 T - What pinion gears would match these ???

Or should I go with other sizes ??? What pinion/spur do you use ??

Both torque and top speed would be nice :027:

Thanks