A 722.3 auto tranny will work fine, no electronics required. A plain 722.3 will handle the output from a stock or maxed-out OM606 (175-225hp) without mods. If you want 400-600hp (which I doubt, as you didn't specify this in your original post) then you'd need the 722.3 rebuilt with SL600 internals, which should take the power; and it would be a bolt-in. BlueRidgeMB in Atlanta can build one for you with Kevlar clutches, etc but it wouldn't be cheap.
I'm not sure what manual trans would hold up behind 400-600hp but for ~200hp, there are lots of options.
