A few things I think are true but not 100% sure:
The stock ECU is probably fine for basic air filter/exhaust mods BUT (and this part is 100%) the adaptive maps which are generated by running the engine are lost when the battery is discounted. May or may not be a big deal to you to have the engine "relearn" the new engine setup. That said, my engine definitely was happier after I replaced the ECU with the one from G56 and did a few map merges.
In my early conversations (phone and email) with S&S about X-wedge mods they were very helpful until I mistakenly let them know the engine was in a Morgan. They then said I needed to talk to Morgan about mods, parts etc. No doubt related to emissions compliance concerns and OEM agreements with Morgan. I have since just ordered a few parts (gaskets, tappet covers, etc) from them without issue.
I believe the engine Morgan uses is a basic spec 121 inch X-wedge. However I imagine the engine mapping was custom developed by Morgan & S&S to meet emission standards.
I believe all X-wedge engines use the easy start cams, as they were developed for the X-wedge and later for Harley engines (from an S&S video on their easy start tech). Haven't been far enough into the engine to confirm that.
