Keep looking, it is a great book. I came across mine on ebay for around $20 and it happened to be one that Ken was selling himself, he even autographed it before he shipped it. They are out there without paying an arm and a leg for them, just keep looking.
NASCAR sanctioned our local dirt track for 20 plus years and they ran everything from 4 cyl cars up to late models. So technically anythng you want to build could be put under the NASCAR category. Either way nice build!