The 759's and the 761's offered NH230 Cummins, 6-71N Detroit, in single axle and NH 230 Cummins, VT-903 Cummins, 6-71N, 8v-71N Detroit in tandem trucks as well as plenty of other options. The 758 was probably about the same. The 1674 Cat was offered in the 761 tandem. There's a Brockway (not sure of the model) just up the road from me that has a Detroit (there's no doubt when you here it), but I'm not sure what size. I'm kind of partial, but you can't go wrong with a Detroit.