Whew! - I'd tread slowly here, depending how much of a stickler you reckon to be. I'm midling stickeley, myself, but some of these definitions are generally very loose.

OK. I'd seek careful documentation on the dates. While sails were, of course, hauled then & long before, packets and clippers is what gave rise to the chanteys. There was rarely much need for them before 1800. Or after, say, 1910. Only a bare handful of chanteys predate 1800

The cited record "Seaport 76 Colonial & Rev. Sea Songs" is from Folkways and, like all of their production is still available from smithsonian/Folkways. Camsco is trying to work out a deal to market them, I believe, but I don't think they have yet. You need to go to them direct. It is a very good record and you can't go wrong anyway - but there's the other thing...

I think nearly all the songs are very late 18th century (so will "qualify" for you there) I think only two are actual chanteys. The rest are forebitters (songs sailors sang for pleasure, not work songs) or else "sea songs" that deal with some sea matter ('my loves gone to be a sailor' - like stuff) but were maybe never actualy sung at sea or by sailors. I'll have to go look out its notes if "Sam's Gone Away" actually dates in chantey form from that long ago - just wondering.

There are endless books on sea songs and the chantey Bible, of course, is Hugill's Shanties of the Seven Seas. There are also a number of very good web sites with many chantey texts but for documentation, I'd definately head over to The Contemplator

Good luck. I'd like to hear your stuff some day.