Ford and Shelby won TA titles '66, & '67 or until the new 302 Z-28s dominated in '68 by winning 10 of 12 races. Shelby destroyed something like 30 Tunnel Port 302s during the '68 season. Ford began '69 by winning with the BOSS 302 but ultimately lost to the Z-28s again when the Z-28s won 6 of the last 7 races. In '70 Penske/Donahue went to AMC, Shelby lost factory support and quit due to a poor '69 showing, and the '70-1/2 Z-28 was a major step backwards. Ford won the '70 TA title by one point (I think?) over AMC, hardly domination. AMC easily won in '71 & 72.
Yes the BOSS 302 was the stronger engine, it just didn't dominate.
Scott
http://www.deepthrottle.com/History/...m_champs.shtml