Jeep liberty suspension
My wife has a 2007 4x4 Nitro, it’s just a Jeep Liberty in drag, I don’t see how all that iron would possibly fit under a 68 Dart. Perhaps you are looking at a two wheel drive donor which I have not ever seen... Not a big seller here in Maine. LOL
Disk brakes from the Jeep will require a much larger diameter wheel to be stuffed into the dinky Dart front wheel wells, and those tall struts and huge control arms will be a challenge.
This spring I was wondering the same while replacing Nitro’s lower ball joints, brakes and rear shocks, would this suspension fit into an A Body, or the rear axle be a suitable replacement with its disk brakes, and low gearing. I came to the conclusion probably not unless someone was building an itty-bitty big foot monster truck atrocity. LOL