I'm currently using
Bazooka v2.9.3 in WoW Classic. It's the same version used for Retail and I just corrected the Interface .toc for WoW Classic.
Unfortunately there aren't many LDB plugins available for Classic yet, I just have a few "buttons" added from other addons such as
AtlasLootClassic for now, but I'm constantly checking for new and updated LDB plugins.