The Serpent and the Rainbow (1988): takes place mainly in Haiti, where an american anthropologist is attempting to study rumors of zombie resurrection only to find himself caught between the combination of the Tonton Macoute and Voodoo occultism

Salem's Lot (1979): The original miniseries (2 parts iirc) This one has one of my all time favorite Nosferatu style vampires, along with Richard Straker, a very proper and suspicious antiques dealer played by James Mason

Texas Chainsaw Massacre 2 (1986): Silly as it may seem to recommend a sequel like this, Texas Chainsaw Massacre 2 is pretty wild and introduces Chop-Top played by Bill Moseley who is simultaneously disturbing and hilarious, always in a horror-y way.

These are probably like a 5-7 out of 10 for scariness, but are some of my personal favorite horror movies, one more recommendation which I'd give a somewhat higher scare value, but isn't in that era is

Frankenstein's Army (2013): Neat storyline, and some really cool practical effects. (Not army of frankensteins which is another film entirely from 2014)