There are no bolt in brushless motor/center diff mounts for that vehicle and I doubt any other center diff would fit without modifications either. But you do not wa t to swap in a different so enter diff anyway. The spur gears are larger in diameter than most truggies due to the ratio of the front and rear diffs. The front and rear are buggy ratio (3.31:1) and combined with monster truck size tires requires a large spur gear to get the required reduction ratio. That's why truggies use 4.10:1 for their front and rear diffs so they can run a normal size spur gear.
You're best bet is making a motor mount that attaches to the chassis. You could even use the original engine mounting holes in the chassis to bolt it down. Then get a battery try's, mount it, install electronics and let err rip.