Ok, then yes you need engine mounts.
A standard shaft crank is threaded almost it's entire length.
A pilot shaft or SG crank has a few threads close to the bearing and then a smooth shaft the rest of the way to the end. You will need a standard shaft unless you want to change the clutch as well.
If you are not racing and just want to play around with the car an OS .15 or .18 CV side exhaust standard shaft should work great. If you want even more power an .18 TZ should be available with a standard shaft and you will need the rear exhaust pipe as well.
If you want to race you will need a .12 unless your local track allows other motors.
Sean. Certified speed crazed mowron.
Team Shepherd USA