I was overseas at the time but I recall reading about the systems back then, as I recall Ford also had a similar system (at least in development) also.

While the idea may have been sound, the technology at the time was not advanced sufficiently to really make it workable (kind of like comparing the old mechanical Rochester or Bendix fuel injection systems to today’s fuel injection).

Although variable displacement might be an interesting exercise in engineering, the goal of upper 20’s for fuel mileage should be pretty easily obtainable with a well thought out drive train and engine build without the added complication (especially if you’re talking about using a SBC).