I can't find any other mentions of Salt Walther on HNet. According to Wikipedia, he also raced unlimited hydroplane boats. It looks like his 1979 appearances in 'The Dukes of Hazzard' and 'The Rockford Files' were his only acting credits.
Following the crash, Walther apparently became addicted to pain killers, and despite a few comeback attempts, his later life included a few drug convictions and jail time. His death at the age of 65 was the result of a drug overdose.
Here's a video about the crash.