Exactly. The engine seems to be pointing up towards the front, so the angled gasket gets the air cleaner a little closer to horizontal. It was also necessary in my case, as it was hitting the fuel inlet on the Edelbrock carb I'm currently using. Turna, I'm not sure which engine you've got, but the problem in this case is the 455 typically brings pretty much any air cleaner other than the most extreme drop base into contact with the hood. Compare the relationship between the air cleaner and the rear hood seal in your pics with this one.