67mph? Because you put down 7" tires; no one in their right mind would set their truck up for ~70mph using tires that big, nor would they use 14 nimh cells

You wont get to more than about 30-35 before the nimhs explode.
Those motor mounts (BLue Groove = bad copies of Mike's stuff) wont work either probably, different trucks = different layouts.
Again,
You really need to do a lot more reading-
You either need to make a motor mount like LincPimp (search his threads), or purchase something fom KershawDesigns or FLM (conversion chassis).
You need to run 5-6s lipo, or 16-18 nimh cells with a ~1600-2000kv motor.
You need to be realistic about the speeds you want- the savy is not a good platform for high speed, its too heavy and too tall for anything other than straight line speed runs, and even then it will be prone to getting out of shape- you need a nice low slung revo/ maxx or truggy for going fast.