That's a one of a kind. Gary Cope's 303 Olds experimental Big 6. It's a 261 Chevy block. The displacement is via an offset ground crank with 292 connecting rods fitted. It sounds awesome:
https://www.youtube.com/shorts/F7hCZh9w1-EApparently the single most time consuming part of the build is the Olds rocket wire-loom valve cover.
