FWIW, the TransAm website (
http://www.trans-amseries.com/ ) box scores from 1969 show Ed Leslie finishing 27th @ Lime Rock in '69 in a Camaro. (But you probably already knew this.)
Also they show two 67 Camaros running @ Mid-Ohio in 1969. One driven by Robert Barg (31) and another by Levester Lewis (32). Other sources show Barg co-driving with Rick Stevens in his "Camaro" that year.