One of many magazine titles that was a casualty of the big magazine company take overs a couple years ago. The last several years of its existence it covered a lot of "Traditional 50s/60s Hot Rods and Rat Rod" type of cars.
I believe that mag is from the 50's, August of 53 to be exact.
LINKY TO COVERS OF OLD HOP UP MAGI was surprised to see it was back in publication though WOW!! Don't know if it still is but they have a website and FB page