Mechanic Shops for 1990 GMC S-15

I have a 1990 GMC S-15 Sierra Classic with the 4.3L TBI V6. It's a family heirloom at this point in time. I have a few issues with it, particularly the engine loping at idle, and an electrical draw on the battery that I need to get figured out. I'm handy but don't have a ton of experience working on old cars, nor do I have the time or space to tinker my way through it right now. As well, I'd just like a thorough once-over of the truck.

I've taken it to a few different shops in East Nashville, and they've been pretty honest with me that they don't have the best equipment or knowledge to be working on TBIs any more.

Any recommendations for shops or mechanics that specialize in older vehicles? I have an appointment on the books with H & H Automotive Repair but am trying to find the right place to take it over anything. Thanks!