Be sure to pick up 9 and 10 tooth pinion gears for that motor. It likes to rev. Is the shaft 1/8" or 5mm? You'll NEED the 5mm shaft rotor/endbell for everything else except for the the rcm mount, otherwise the shaft will snap do to the excessive bending moment from mod1 gears. The rcm mount sets the motor close enough to the spur gear.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy