And in Mopar world, it's a 318 until the Magnum line came out in '92/'93, at which point it's a 5.2. A 5.2 and a 318 have the same displacement but are not necessarily the same engine line. 318 is LA, 5.2 is Magnum.
Everyone calls the later engine magnum engines. Most people I know even call the later ones 318 and 360 magnums. Even the 80's Dodge ads use liters. I believe this ad is 1989...
In any case, the original poster is talking about a TBI engine which is an LA or pre-magnum engine