Interesting:) I knew a tiny bit about these engines, as a friend is doing a swap of one into his UNIMOG. He bought a MB 300 as adonor, and later found another which is now his DD.
But I was surprised at all the variations when I did a quick google search
http://en.wikipedia.org/wiki/Mercedes-Benz_OM617
The HP/TQ numbers leave me thinking I (personally) would become impatient driving one of these:)
Probably still an step up from the smaller 6 cyllinder:)
Which version of the OM617 do you have, and what trans are you going to run behind it?
James