Yay another resident of the armpit of america! :lol there is a member cincystangs or something like that, he can help you closer to your area.
I've gone with another member here to the dyno at Dayton Performance which looks like a legit place. They are more fox body, 5.0 oriented but definitely a performance shop and it looked clean and professional. They've been around a while, but I don't have personal experience with any of their work.
I'm sure if you call them up they will be happy to help. Just because they do work on super fast cars with bigger motors doesn't mean they are going to refuse your business. They seemed very courteous and respectful, I don't think they would make fun of you if you are serious about spending the money and letting them do the work.