A bit off topic, but Carnival of Souls broke my heart. I remember LOVING it when I was a kid, but I rewatched it recently and could hardly get through the thing. I HATE when that happens, and I try not to let it spoil all my good memories of watching it when I was younger.
Oh, and this is totally not an old classic horror movie, but Human Centipede 2 was in black and white, and it was amazzzzing. It's super gorey, but also kind of has a David Lynch feel to it. Sort of if you combined Eraserhead and Hostel. Worth checking out if you love gore. Nothing like the first one.