My third great grandfather William Ritchie was born in Ayershire, Scotland in 1755 and webt to Ireland to live when he wss 36 years old and became a ship builder then.
We don't have a dedicated project, but there are some categories. See Ulster Scots and Scots-Irish Immigrants to America.
Just came across some
https://books.google.com/books?id=pL-UvhuapaMC
The junk never ends. Please somebody make it stop.