In Savannah, I've used Auto Machine of Savannah on Old West Lathrop at Augusta Avenue. It's near the intersection of West Bay Street and West Lathrop - where you turn off of W Bay to get to the main gate of International Paper and close to where I-516 (Lynes Parkway) passes over W Bay. The entire property is bordered by Old W Lathrop on the west, Augusta Avenue on the south, West Lathrop on the east and West Bay Street on the north. You can Google Earth of Google Maps 12 OLD West Lathrop Avenue. Sorry about all of the directions, but it can be hard to find.
Guy's name is Raymond, but I hear there is talk that he might be looking to retire. I've used Raymond since the 1970s for everything from work on built big-blocks (my younger days) to re-doing the heads on a Mitsubishi SOHC I was working on last summer. They are far from being the least expensive, but in my opinion, they are dead-on the best. It's the machine shop that places like Mall Motors (on Montgomery Crossroads) uses exclusively for their machine work.
Phone is 912-233-1123.
I have heard good things about Saul's Cylinder Heads, too, but I've never personally used them and I don't know if they do short blocks.