Good mopar engine shop within 8hr drive of north GA

Recently rejoined the Mopar family. My first car in 1993 was a 73 Charger SE 400. Now I've got a 68 Barracuda with a mopar crate 360 390hp version. The prior owner was somewhat unaware of what he had. I've got the receipt for the engine; so I know its the 390hp version.

From what he said I think it has a bigger roller cam and roller rockers. With Mopar Fuel Injection kit and long tube headers.

Sounds like the rocker arms needs adjusted. But I've never owned a big cam mopar. He said it needs the ECU tuned. It has a occasional backfire at low load around 2000rpm. Runs good at idle and med to heavy loads. Doesn't feel like 400hp. But I've not driven a old mopar in 20 years.

I'd love to take the car to a good engine guy for a rocker arm adjustment, check compression, cam timing and good overlook of the engine. Any good mopar engine guys within 8hrs of Atlanta? Or a speed shop.

I need to get it checked before getting the ECU tune.