I just purchased a book called how to re-build and power tune edelbrock carburetors and i was reading about the secondary clusters and it says altho they look the same they are not and must be placed in the exact same spot they were in. I recently pulled the secondary clusters out to clean my carburetor and i did not know that the secondary clusters were not the same and so now i do not know if they are in the correct spot or not and i do not know how to determine this. In the book i got it does not specify how to tell and i was hoping you guys would know? they look identical to the naked eye so i have no idea and dont know why it even matters wich side they are on because i cant tell the difference between the two but obviously there is a difference.