One of friends was a Harley mechanic.
Thinking about a Morgan at first I think about a threewheeler. I speak with my friend. He looks at me: don‘t do it. At Harley we hab massive problems with the first bigger bored TwinCams... they where 1.6litres. Now we have 1.8 and much more torque. You must pay for it two times, when you buy and the live of them is shorter...
And further: the S&S engines are nice upgrades for a Harley. But a Harley is a „light“ bike. You ride it on a flow, low revs and enjoy sometimes the full power, torque and revs. That works. But a Morgan is a car. So you always use the revs, the torque and the full power.
In summary: the is always stressed.
Summary for me: no threewheeler.
René