Great Work on the Viper conversion. I can't wait to hear your results.

To get enough useful rpm out of a MA 8x6, you will have to go with at least a 1000Kv motor and 5S 3000 pack. My Predator with the Turnigy 35-48-1100 on 4S with a 9 x 7.5 APC "E" prop is around 100 mph. Not sure what your target speed is, but it is a starting point.

Archie Adamisin
Muncie, Indiana