Ditto Librands S/S system on 2005 blacktop Zetec 4/4. Very good improvement, +15bhp on dyno and much more driveable. However it is also much louder!
Librands systems are actually made by Piper exhausts.
As to who to fit it, I would have thought most Morgan dealers or specialists with any motorsport interest would be up to it. It depends where you are. Mine was fitted by John MacDonald's (now Beamish). I think you are wise to have it done for you, as there can be problems with manifold studs. If you ask Rob Wells at Librands he will probably know who in your area would fit it for you.
Nigel