Not sure if these guys are the same owners. They used to be somewhere in the SW...Arizona or New Mexico as I recall.
I have a friend who had an NAF Cobra (attached photo), but has since sold it. Cannot recall if he had any manuals. I asked if he could get the details on the engine when I was working on the car. He contacted John Kube, the builder but was told it was in some box in his attic/store room and couldn't be bothered to go get it.
Also, saw this (May 2017) post on CC...
"Jack Kube owned NAF. Built cars in Tempe or Scottsdale AZ and went out of business in the late 1980s. He moved to the very small town of Superior AZ, where he occasionally built a very few cars. He died several years ago and his widow sold out all the remaining parts and molds. I owned a NAF for 13 years and it was a pretty good car. The fiberglass was very thick and the frame was 2"x4" box rails with 3/16" thickness. There are other NAF owners on CC and perhaps they will chime in.'