IAIN KEITH joined AJ Foyt Racing in March of this year as a front end mechanic who also goes over the wall to change the inside front tire on Sting Ray Robb’s No. 41 Goodheart/Pray.com Chevrolet. Born in Chattanooga, Tenn., Keith was raised in Georgia and currently lives in Westfield, Ind. The 28-year-old graduated from…