I just heard a song from Glorior Belli called "In Every Grief Stricken Blues", which has some strong southern influences. it's a really good sound, anyone know other songs and/or artists that experiment with this?

Goatwhore have some Southern-inspired moments.

Phazm "Hate At First Seed"

Killer fucking record (their only good one IMO), mixes BM with Entombed's "Wolverine Blues" and "To Ride..." - not just through riffs but with the same tone and attitude as well, has that dirty-bluesy-boogie (and some great slide playing too).