I'v got nothing to do at the moment, so i looked everything up for you.
All information is from the Holley Illustrated Parts and Specifications Manuel.
4383 1970 440 engine. US & Canada Standard and Auto Trans. (Rear)
4375 1970 US & Canada, Standard Trans. Center Carb. 440 engine.
4175 1970 440 engine. California carb. Automatic and Standard transmission.
Appears that you have a set up that was put together with mix matched carbs.