Before Clark died, I heard he was going to remake his own film, but sadly never came to light. This is a far cry from what modern zombie films a like, but this was pre-Dawn of the Dead (1978), but a lot of fun if you like campy, fun 70's movies! There isn't a ton of gore, but plenty of eccentric performances and OTT acting and silly zombie make up effects.
The film was shot in 14 days on a budget of $70,000. Clark employed some of his college friends on it. Encyclopedia of Horror concludes that given the budget and the number of personnel involved, the special effects by Alan Ormsby are "surprisingly effective". The Region 2 dvd features a trailer and commentary by some the film's actors talking about the late Clark and the production.