It's been a great while since I have seen Nightmare at Noon, also known as Death Street USA. To put it nice, it is a B-rate Sci-Fi turd that clocks in at over 2 hours long. It also stars Bo Hopkins (one degree of separation; he was in Sweet Sixteen with Dana Kimmell!) George Kennedy, and Wings Hauser. The movie in a nutshell is about evil scientists putting a questionable substance in the town's water supply, which in turn drives the residents to become blood-thirsty.
The movie was directed by Niko Mastorakis, who also did The Wind and The Zero Boys, which also connects him the the Friday the 13th franchise. The post art for The Wind was also used for the Turkish release of Friday the 13th Part V: A New Beginning and the Zero Boys had a scene shot at the legendary cabin at the Veluzat Movie Ranch, which was of course used in Friday the 13th Part III.