Wow. Thanks everybody for the in-depth and informative input! I've been talking with another monkey about the 4BT, and I came to the same conclusion about weight/performance/and suspension, so that one's out.
I did find two cores from a '85 jeep Wagoneer, and a Cherokee. I've been doing some digging to get some information about what those engines were (Renault or the "Valmet" 411?) But i'm not getting too much information about the availability of parts to rebuild/build it, so... maybe I'll look into the other light-truck/ Benz otpions.
The reason that I asksked about the diesel-swap is two-fold. First, I own a diesel at the moment, and enjoy the reliable and consistant power it provides. (not really too conserned with speed) Secondly, I am also considering doing it as a biodiesel, which would make the Benz option much more accessable, due to the availability of the conversion kit (not to mention the advice of many others who have done a bio-conversion on those engines).
My driving style is "I want to be...there, if I can make it", but I don't fancy bouldering so much. A unused forest trail would be about the extent of my "muddin". I'm definitely not putting a snorkel on her.
If I compile all the cost/benifit anylisis, the diesel conversion might have to wait until later.
I might just go with a jeep 4.0 swap... unless someone can tell me a good reason to rebuild the 151 Duke that I have in it now.
I'm in Damascus, and I look forward to the Clackamette Meet! Howdy Oregon Eagles!
--Oh, and if anyone's interested I saw a '81 Kammback for sale for $600.