98MM Box Stock is a great place to start, running a narrow car would be a challenge in my opinion. Kyosho Motor mounts are pretty cheap, the MR04 MM pod is actually very capable and lowers the CG a lot. Tires and practice really seem to make all the difference,

Having two cars/classes to run mean more time wheeling when you can run one and let the other cool off. The Evo2 with the 5600kv is going to take some getting used to, or dialing back the throttle if you have a radio capable of that. I have an MR03 Evo that I ran the 4100KV motor in for a good bit and it was actually surprisingly fast (ran fine with a 10T PN pro match pinion) and easier to handle. 4100 would be Stock class, 5600 Pro Stock.

Marka V1 10 slicks work really well for me (V1 15 Radials are on my Box Stock now, they seem great too), front PN (KSM or KS medium, KSK 35 or 40 all low profile) are about all the traction you could ask for. Depending on conditions I run Reflex Speed dish wheels with the side wall plates to keep from traction rolling, but you might be fine without them. PN Low profile tire and a 23.00 disc will have you off to the races.

Never a bad idea to check back on this thread and see setups people use, pretty easy way to get started. Bodies, springs, t plates, tires etc.