One of the colums is written by Ray Bohacz, whom I met once. Very nice knowledgable car guy. His column this month touches upon what he thinks is the high water mark for American musclecars. He wrote that most 60's musclecars had a hard time to break into the 13's and triple digits in the quarter.. He goes on to say that in his estimation the high water mark for American musclecars is the 86-87 Grand National and 89 TTA!!! Yes you heard right. He says that stock GNs ran high 13's at around 95 and TTA's run about 100 mph in the quarter. He wrote that he tuned a new 89 TTA back in 89 and got it to run 11.7 @ 114 with basic bolt ons with slicks and race gas. 
