Dennis O'Berg ordered this sleeper new. It's outward appearance is unassuming (sans stripes & cowl hood), however a look under the hood and interior floor mounted shifter, tells a different story. Although the engine script indicates 400ci, which was a designation for a small block, the 402 LS3 big block breathes beneath the hood. Congratulations to Dennis for preserving and enjoying the car for almost 50 years!!!
https://www.hotrod.com/articles/rare-original-owner-1971-chevelle-malibu-with-ls3-402-big-block/