Don't bother. (An SVTF owner here..) Too much hassle. Some SVTF guys have considered removing it and replacing with an MTX-75!!
1st gear has the bigggest sprocket they could get into that thing. It's still relatively tall. (runs out at 40mph..) You can break the speed limit in 2nd.. Gears get closer once above that, and 6th is not an overdrive. Despite all this, 1st gear is lower and 6th is higher than a Mini-S...
And the MAX input torque on it is rated at somewhere around 150Ft-Lbs.
Need I say more?
BTW: Requires a two-piece flywheel (tortional vibration dampener...)
