I would ditch the factory motor mount, it is WEAK casted alloy. When I built my kit thats the first bad I had on it. I went with the GCM solid alloy mount and works great. Also the front end is weak in these with the chaeap stamped alloy plates that hold the A-arm pins to the diff case. Smashed my front end within litterally 3 minutes of messin with it in my driveway.
Oh, and the Pro-Line Powerstroke shock kit for the Slash front & rear is what you need if you upgrade, awesome shocks.