There's an old 70 Camaro L78 beater on ebay that looks like it has some history with this group. Never hard about this type of racing before and from what their site says they have been arouns since 1959.
http://pahillclimb.net/
Anyway, this L78 Camaro beater looks like it raced in PHA.
http://cgi.ebay.com/ebaymotors/1970-Cama...=item3cc7f1c61a
Rich Pern