I had to take a '67 Dart GT (273 - 2 bbl) and add a 340 w/ a 727. Along with an 8 3/4 rear end. Not quite a 340 GTS (since the 340 came out in '68), but the car performs very well, knocking on the 13 second door (best of 14.17). Not astounding by todays standards, but very respectable by the standards I was working under in the late 80's early 90's...