They have older Hot Rod scans but they have so many limited pages I cant find sh!#.
I've already checked libraries all over the state - nobody stores Hot Rod's that old anymore, it's not considered of high interest. They used to, back in the 90's, but they don't have 30 year old stuff. FWIW I actually DO have a box of all my old hot rods, possibly including that article (I cant remember if it was in one of MY magazines or something I got at the library at the time) but I can't dig for it anytime soon.
Beau is probably correct - that sounds familiar - Crower Mileage Maker. Yet a google search shows... one relevant response?
Crower Mileage Maker Cam Page1 - Popular Hot Rodding Forums at Popular Hot Rodding Magazine This guy mentions it, but like every other case i've ever seen it or tried asking about myself, the other 'hot rodders' pan the idea almost instantly without really researching it.