Abby, I can't find anyone credited with composing tunes for songs in McCurdy's 'Dalliance' series. On the first of the 'Dalliance' volumes it is said that most of the songs are from 'Pills', and musical arrangements are by McDarkin.
On the other two 'Dalliance' vols. and 'Son of Dalliance' the most that is said is that the musical settings are copyrighted by Ed McCurdy.
You were lucky to find that MacColl/ Merry Muses recording. The only info I saw about it said that you had to mail order it from an address in New Orleans. I wrote to the address requesting price (probably several years after it was issued) but never got any answer.