The 10L like i said, is strong enough for a savage. A friend of mine reaches 71 km/h with the 10L on 16 cells. on 14 cells it allready is faster and stronger than a .25 (fixed in 1st gear that is)
this is the heavy duty 2nd speed i am talking about..
You don't really need a backwards, and you could use a backwards conversion for your savage.