This meteorite has several pairings, classified as CV3, CK3, and C3-ungrouped. DaG 978 is officially listed as a C3-ungrouped. We purchased and donated an additional ~30 gram cut stone to UCLA solely for study, and comprehensive work done there has shown it to be unrelated to any known groups of carbonaceous chondrites.
Here’s a link to the paper, which draws upon a variety of literature on various carbonaceous chondrite groups:
Here are some photos of a 160 gram end-cut of this odd meteorite.