I put out a call on FB to my Columbia beer buddies to see if any of them have a favorite mechanic. One guy had a Porsche for a while, but I'm not so sure I would use a guy who does foreign cars for working on my truck.
I know a good guy in Sumter, but that is the wrong side of Columbia for Chapin.
I did find a good one! 3 Man Auto down Rosewood Drive near the intersection with Assembly. One of my coworkers happens to have the same truck as me and he recommended them. Prices are good and the old timers there know the old Ford trucks pretty good.