............ One thing I'm confused over is the Easyup Hood, does that suggest that the original hood is not easy to put up?
The older style of hood, that was standard for 50 years (such as on my 1989 4/4 4 seater) is simliar to a Scout's ridge tent. Hood supports that fold forward, then lay the hood on top, and pop the edges of the hood into place. The Easyup/quickfit/simmonds hoods are a similar design to your Z3.
I suggest you visit your local Morgan Dealer or Morgan owners group. Let the forum know where your are and we can advise.
BTW the models numbers may be confusing e.g. My 4/4 has a Ford 1.6 CVH, a new 4/4 would have a Ford 1.8 but with different chassis dimensions. 4/4 = 1.6 - 1.8 L, +4 = 2.0 L, roaster 3.0 L, +8 = 3.5 - 4.5 L.