Check out Ewing Machine in Snellville. Mr. Ewing is a Darton distributor and does a lot of machine work for performance shops. He's done at least 10 Darton MID sleeve installs for friend of mine. He's listed in the machine shop directory sticky in the General Tech forum.

He'll walk you through every step of the process and even show you what machines and what type of jobs he's done. He's not snobby and stands by his work 100%. He'll listen first then ask you questions then give advice on what he recommends. He does everything in-house you don't have to worry about who's working on your motor.