That is an excellent idea. I have a 2" factory cowl hood with a 327 and was wondering how close my air cleaner was to the hood's air cleaner opening. I'm thinking of using an air cleaner filter lid to increase airflow from the cowl. Your idea will allow me to check how close, and how the air cleaner lines up with the cowl air cleaner opening.I have a 327 with edelbrock performer eps and edelbrock carb. When I was checking fit - first I asked the mfg. I also then took clay and kind of rolled it up and stuck it on thr highest point of the aircleaner. Keep checking at different lengths until the lid hit the clay. Then I knew how much space I have to work with.