Crash

My son had a pretty bad car wreck today(He's okay)went to the DR's and everything seems good just going to be sore for a few days. A guy ran a red light and t-boned our 1995 Grand Cherokee. We bought this car new and it served us well as my wife's daily driver up to 2009 when we got her a 2010 Challenger. The G.C became my sons car at that time. Luckly the other driver has insurance and ther adjuster is coming over Monday to asscess the damage, it will be totaled only the passenger side front door opens, all others the body damage is to great to open the doors. So which leads me to my question, has anyone ever put a 4.0 liter six into an A body? I have a 73 dart with a slant six in it and a cracked block, still drives good weeps a bit of coolent out the block, but I keep an eye on it so I still drive it on rainy days when I dont ride my motorcycle to work. Do you think the Jeep drive train is doable or am I wasting my time and effort? Drive train only has 150000 miles on it and still runs strong. Any info or comments would be great. I'll post up pictures when I down load them from my camera.
Thanks Kevin