Classic Raiding? TBC Raiding?

Hello! I am a level 60 Paladin on the Alliance side of Lordaeron. Those details don't matter I suppose, because I would be willing to level a new class / faction / spec if I found the opportunities I am looking for. I want to raid classic content like normal, with other level 60s, and then move to Outland as usual, and then raid TBC content before actually going to Northrend. However, I noticed that most people on Lordaeron (especially full guilds) tend to skip over most if not all pre-WotLK raid content in order to speedrun level 80 and start raiding in Northrend. Are there any guilds open for recruitment that raid Classic (or TBC, but preferably Classic for now) content?

Not mentioned in the original post, however I would like to mention that while doing multiple runs for good gear or something is preferred, I'm down for any guild which is willing to raid those instances, just once.