There's 2 that I can think of. 340's were performance only. No 2 barrel engines in sedans or trucks. So, saying all that, the 340 and 426 Hemi were the only 2 that were "performance only" engines.
I love small blocks but they weren't performance engines "from the factory". Head flow was abysmal, They had hydraulic cans with non-adjustable valvetrain, two bolt mains, cast pistons, low compression, on and on. They were designed for reliable passenger car transportation.