I'm trying to find my grandfathers, grandparents. Pauline Deluna (Spanish?) married Joseph J. Lorfano (DeLorfano?)

I know they immigrated to the USA around 1800 and had a farm stand in Little Italy in Portland. The family still lives in Scarborough but I can't find them previous to there immigration, if I could find an immigration record or if they were married previous to there immigration.

Also I believe they were from Avelino Italy but I'm not sure and I don't know what immigration center they went through. I'm inclined to think they came through Boston, but I don't know if boston even handled immigrations and the documents are so few that i'm thinking they might be illegals.
I know a little bit more but Lorfano isn't a super common name in Maine so i'm hoping this is enough for now. Also i know that Joseph had cousins that arrived about the same time as he did with Paulina, and they voted to keep there name "Delorfano."