What will your break in procedure be? I am breaking in a rebuilt TR powered +4. 500 miles below 50 MPH, re tighten head and then go to beat hell and loosen it up fast. Not sure this is a good idea on a New Morgan. Maybe not a good idea on a rebuilt old engine. But, so far, I get a pretty good engine but not a pretty long life engine. I will change oil every 500 miles to about 2,000 miles. Oil with ZDDP added.
Hi Button
As has been said new engines don't really need running in anymore . I will take it easy for the first 1k no more than 50/60 MPH in case anything else decides to fall off

No seriously I'm not expecting any issues (touch wood) none of the others gave me to many problems even had one that didn't leak