what motors fit in the 2.5 t-maxx with minimum mods (ie...cutting the shaft, changing the mount and drilling holes..etc) other than the specific "drop-in" motors as I know they fit directly. I noticed an O.S. .21 small block that states it fits in the mounts of standard SB's with 1.9hp and only $100 new. Just checkin out my options as I need a new carb and the 10D carb is like $70 anyways, if a little more money will get a bigger motor, well............... .