LA318 question

Reading some threads about 318 engines (LA & Magnum). I was wondering if there is a way to determine if a LA engine is flat tappet, or roller lifter, without taking anything major apart.
I have a 1988 Diplomat, that I bought new in '88. Engine has never been opened up. Only thigs done to engine are routine maintenance, and removal of the lean burn system, for the HEI (carb and dist).