Ok after reading some of the other post on this site related to the Tekno clutch I decided to pull the trigger and I ordered one on Monday. It arrived today and I spent most of the night fabricating a new motor mount. I started by raising the center diff to give me more room, I then mounted the motor, attached the Tekno clutch (currently I am using MIP shoes) with a traxxas 15T bell. I also had to move the brake servo slightly to clear the bell. I hooked everything up and ran it on the bench just to see if it worked. The clutch acts just like a nitro clutch. When I gave it throttle the motor would spin but there was a slight lag before the bell would move, then as the speed picked up the motor spun the bell/spur at full power. This is just what I was looking for. Tomorrow I will put some street tires on and give it run in the yard to see how it performs under a load.
Here is the new motor mount next to a RC-Monster mount and my originally mount. The new mount has been extended to provide more support.
Here is the mount and Tekno clutch attached to the chassis.