As for speed you really want as fast as possible. I like anything with a speed of .08 and under. For torque I believe tekno is the only company that give a required torque spec for their cars. Tekno says on the eb410 and et410 requires a servo with at least 200oz of torque. And on their 1/8 scale buggies and trucks they say requires a servo with at least 300oz of torque.

i personally run the futaba cb700 in most of my cars. You can’t beat the specs. It’s brushless with a .07 for speed and 681oz of torque and I run it in SR mode. They are about $150 shipped online. A good cheep option would be the futaba s9372sv. Not brushless but has 341oz of torque and a .06 for speed and it’s about $115 online.