8.5T motor is fine, will be quick but you may need to add some weight around front end/servo area to help balance it!
i've got 60g on the nose of my SCT... tbh all of the 2WD SCT's i've raced have needed this at least IMO.
servo wise, i use one of these:
http://shop.a1hobbiesltd.com/index.p...product_id=771
was only a temporary cheapy to get truck on track asap whilst i waited for a Savox, but can't fault it, is metal geared, has taken lots of abuse, plenty quick enough and never let me down, so well recommended.