Like most things Mopar, between the late 60s models and about the restyle season of around 71-73, everything got bigger. That included the vans. A 72 B van is a lot bigger, and a lot more heavy then the old 60s vans were. 76-78 was the Van hay day, big motors, custom paint, custom interior, conversion vans, 4x4 versions, they were the first "adult toys". You had to install a 340 the 70s vans, they came with either a 318, or a 360, or you got a 383 (later a 400) or a 440. The big blocks hauled them around pretty good. Gene