Pretty sure I am conflating two different movies here, but I’ll give it a shot:
This is an early 70s drive-in exploitation film that showed up later in the decade on a local TV Midnight Horror feature. There is a scientist or doctor who keeps two young women bound in his basement, periodically taking their blood to revive a lost loved one (it’s not Dr. Phibes). The part that sticks with me is a large half-witted “Lenny from Of Mice & Men”-type character in overalls who carries around a Wham-O Air Blaster while doing the doctor’s bidding.
Any help is appreciated.