From the ScaleAuto Forum:
ED: Apparently our attempt at fun with the April cover has stumped a few of our readers. Our reference to a "Special 4-barrel How-to Issue" was to point out we had 4 hard core how-to stories, 21 pages worth, in the April issue. There is no 4-barrel carb story. Sorry for the confusion, but watch for more engine-related stories in future issues … and we’ll keep trying to have a little more fun here too!
~Mark Savage, Editor