Machine Shop So. Il.
Yeah. Precision in Collinsville which I think is about 20-30 miles south of you. His name is Don and # is 618-288-3779. He's a Mopar guy and knows his stuff. His mid 9 second Duster shows it. Reasonable prices too. His shop is small but he has mostly modern equip. The only bad thing is he's not real fast sometimes cause he usually works alone and gets backed up at times. You can usually figure if you take a engine in for the full treatment it'll take 2 weeks.
I hear there's a good one up in Springfield also but I don't know who they are. What ever you do don't take it to McKay's NAPA (I think you have one their in J-ville). I took my engine there the first time because I didn't know about Don and they screwed it all up. They also screwed up a 454 crank for a buddy of mine.