advise on my electric setup

[lambchops]

Im just building a brushless conversion for an MBX5, I bought my electrics secondhand and wondered if anyone in the know can advise what sort of performance i can expect.

I have a Monster Mamba Esc V3
Medusa 60 mm 2000KV motor
2x 4 cell 14.8V flightpower 4300 batterys

With 14.8 V and the 60mm 2000kv motor is it going to be fast enough for racing and what sort of run times would you expect?

Thanks