If you Google "Houston Area Hot Rod Shops" there's a pretty good list that pops up - https://www.google.com/webhp?sourcei...%20rod%20shops

You might try "Houston Area Custom Shops", "Chassis Shops" etc and generate a list then get in your DD and drop by to visit unannounced. The places that are trying to emulate Gas Monkey Garage should be obvious.

Another option is to hit local cruises, cars & coffee's, and other events and ask around. NSRA publishes their "Fellows" list annually which has contact info for members geographically who have pledged to help others who may be away from home needing maintenance help on their ride. Calling some of those folks could get you a reference or two, too.

For me, I like dropping by and seeing an operation before I leave them a car and a blank check.