I bought a new air cleaner for my 400, but when i put it on my edelbrock, it rests on the fuel line and doesn't sit flush on the carb. Even if I push it down tight so it is flush, i have about 3/4 of an inch too much thread on the top. It seems that should be spacer between the carb and the air cleaner. It's an aftermarket air cleaner. Any ideas? Is there a spacer that I'm missing?