My father handed me a bag of his old t-shirts. Here is what I found:
It says, "SCCA National Rally Championship" "Mid-South Region Sports Car Club of America" "The Bluff & The Truth" on the front and
"Beck Arnley Parts For Imported Cars, Inc." "Sponsor" on the back.
I'm trying to track down the year. The folks were active in the Mid-west Region in the 70s and early 80s. I couldn't imagine them going to Memphis for a rally after I was born, so I would guess it's from the early to mid-70s.
Update: My father was not much help on nailing down a year for that shirt. He said, "early 70s, '72 or '74." but he didn't seem too sure.