Directly from the man that built this beautiful GSX: https://www.v8buick.com/index.php?threads/russo-and-steele-gsx.341775/#post-2890791
btw, it sold for $132k (hammer price of $120k + 10% fee) the last time it went to Barrett Jackson in 2021: https://www.barrett-jackson.com/Events/Event/Details/1970-BUICK-GSX-STAGE-1-244152