I just realized I have Black Sabbath, with Boris Karloff, in my horror films collection. But I didn't recall until I checked that it was directed by the same guy who did the cult classic Black Sunday with the hauntingly beautiful Barbara Steele (Mario Bava).
However, there were two versions of that movie, each with its own dubbing and soundtrack. The one most widely available is weak compared to the one that the Americans (American International Pictures) had dubbed themselves via some New York City audio studio. I have that one in my collection as well, and it's far superior to the one the Italians had dubbed to English when they sold the film to AIP.
Some scenes were cut/modified from the original Italian version for the English market. I don’t know if both Eng lish language versions were edited, tho.