The Volare front end is the simplest swap because the entire suspension system is contained in one unit. The criticism of this suspension manly come from one person, Rick Ehrenberg, and I think he's just being too much of a stickler engineer on the subject. He doesn't like it because the bars don't travel in the same arc as the control arms. It's not ideal on paper, but works just fine in the real world. \
The service manager at the local Chrysler dealership termed it "a three-sway-bar" suspension. Each front wheel had the end of a sway bar attached to it, anchored on the other side of the car. Then the normal sway bar between the two lower control arms. My term is "bent bar", by comparison. I suspect that whatever differences in the arcs are compensated for by the heavy rubber bushings where the bent-bars attach to the lower control arms.
That set-up can look a bit unusual, but it allows for torsion bars to be on ANY wheelbase of vehicle. That module (front subframe) has all of the modern stuff attached to it, too. I kind of suspect that if Ford or GM had done it, it would have been under a lot more vehicles (after they got through wringing-out every last 1/10th cent of production cost).