503 Diesel did some motor work (71, studs, few others) on my buddies truck.... He lives on the west side of cincy, not 100% sure how far it was from him though.
503 is about 20 minutes north of me, and i'm between Dayton and eaton, although you have no idea where that is. LOL They do alright work, a lot of diesel wanna-be's roll around here wearing a ton of 503 gear or have their stickers plastered all over their trucks.
Since i don't use any local shops i don't have any direct experience with em, but a few years back they sprayed during a pull at our big local pull in a class of 30-40 trucks, and supposedly denied it at first then admitted to it even though it was stupidly obvious. IMO thats chitty to go out and cheat like that, but whatever.
Only shop i deal with is Unlimited, and even though we had a few minor issues last year, they've taken care of me and i'm a happy customer. Plus its nice dealing with a shop that actually messes around with Powerstrokes, instead of just fixing em like the shops around here.