It might be The Head, but I haven't seen it in years. The guy's head was kept in a tank with electrodres stuck to it. Alpha has it on DVD for like eight bucks or something.
Definitely not Atomic Brain (AKA Monstrosity). Could possibly be The Thing That Couldn't Die, a Universal B movie from 1958 that reuses the music from Creature From the Black Lagoon. It's kida atmospheric and used to play a lot on late-night TV and creature features. In it, a girl using a dowsing rod unearths the severed head of a Spanish wizard who wants to reconnect with his body. He (the head) hypnotizes the locals to carry him around and do his bidding and at the end summons up his corpse.
My favorite animated head movie--though not what you're looking for--is the The Frozen Dead. "Kill me, kill me..." Great stuff.
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