I won't red X you, but 360 manifolds all have the same 2bbl. pattern- it was the 273/318 manifolds that had a different carb mounting pattern. They used Holley or Carter carbs depending on year and application. The same mounting pattern was used on big block 2bbls., which used the Carter/Holley carb or the Stromberg. The 273/318 carb mounting pattern was completely different, as it was smaller dimensionally (there were Holley/Carter/Stromberg carbs for the 273/318 pattern, too).