Tag your question with the Allen surname and reach out to the Allen One Name Study project.
https://www.wikitree.com/wiki/Space:Allen_Name_Study
But do not let that stop you from adding these profiles, especially if you have the sources.
I see no other special project for you to join with.
FYI, Allen-3478 is a 1st cousin (9 times removed) through John Huggins.