That group of Dart pics really got my attention. My first real car in 1973 was a 68 GT, 318 4 speed, bucket seats. By 1975 it got a built (by me) 340 T/A, Hurst SuperShifter and a 4:30 gear.
Here's the 340, getting it ready to go in, long ago. I'm the engine mount guy. Can't remember whose girlfriend took this pic....chicks always had cameras, guys didn't.