The only folks to use are Quality Powdercoating in Carrollton. 2 blocks off of 35E. They specialize in kit car applications where plugging the holes is an important detail for later assembly. I took a trailer full of parts (Lonestar 427 frame, headers, 9" rear housing, other pieces). They did three things right: first, called daily to appraise me of the status, beat their estimated time for completion of the parts; lastly, turned out a finish better and cheaper than their original estimate. They load and unload everything--never had to hurt my back...go figure.
http://www.qualitypowdercoating.com
Ask for "Little ___" (Brad???)--there are two people by the same name and "Little __" is the one to fulfill all the steps I mentioned above. Just ask the receptionist who answers the phone--she'll know who to connect you to.
BTW: No problems with the business or its operation after the tragic private plane wreck in FL with its owner aboard.
I'd never use anyone else. (Certainly NOT Performance Powdercoating in Greenville/Fate..OMG!)
Paul