Yeah, this thread has been fun to read and very familiar, bought my GTX in 1975 bone stock. With G60 14s and my granny shifting it ran a 15.20, it was my daily driver, first thing my "expert" buddy said was you need headers and a 4.56 gear in that thing...with headers, purple hornies, 7" cheater slicks and better shifting I managed to get into the low 14s. The funny/scary thing about this read is how many of these old parts I still have on my shelves