Tommy – You already may be familiar with these. No personal experience with them, but maybe some leads with some leads if nothing else….
In Georgia, just northeast of Atlanta is Jon Kaase Racing Engines. However, with all of the sophisticated equipment they have, getting dyno time from them may be kind of pricey, if they even allow outside engines coming in. But it may not hurt to check with them as they may know of someone closer by who could accommodate your needs.
Jon Kaase Racing Engines, Inc.
735 West Winder Industrial Parkway
Winder, GA 30680
(770) 307-0241
Jon Kaase Racing Engines - John Kaase Racing Engines
Also in Georgia, just southeast of Atlanta, is Southern Automotive Engines. While they may not have a dyno, they may be able to direct you to someone who does.
Southern Automotive Engines
70 Sims Street
McDonough, GA 30253
(770) 898-9360
Southern Automotive