What I wrote was very specific...."for these reasons the early manifolds fit better on the early As than the older 340 manifolds." I specifically wrote that the early 340 manifolds fit better on the "Early As", which has nothing to do with your car. By the way, very nice car!! Either manifold will fit your car, the major difference would be in price and availability. The early 340 manifolds seem to cost more on average. The early manifolds are slimmer so they give early A owners a little more clearance around the steering box and steering shaft but in a '72 it makes no difference at all. In fact I would prefer the newer 340 because it beefier and less likely to crack/break. The later 340 also comes with those raised ears/ribs which give you a place to attach a plug wire shield. I have a later 340 on my '69 Barracuda and it fits perfect.
Treblig