As much as I love big HP 406 combinations, your use in a Mudbog truck means torque, not high horsepower. The AFR 210's are slightly too big, but you can get away with them if you are geared correctly. The Motown 220's are just too big....if your rpm drops a little too much the motor won't be able to recover the wheelspeed.
AFR 195's would be more apt in this situation. Or Dart Pro 1 195's, or Brodix 200's.