Concerning the flat filter on the WFO setup, I have found that it is not necessary.
(At least not in my situation) I have a 1976 455 Trans Am with Performer RPM intake.
I use the WFO base with a short round filter and the original lid. All is well. In my situation, it would be beneficial to re-machine the top of the manifold so that it is
approx. 1/4" +or- lower at the front carb bolts. Over time, the hood/scoop fit was so tight that the front lip of the scoop broke off. This is not noticable as it is covered
by the rubber seal. It should be noted that this issue has nothing to do with the type
of filter (round or flat) used.
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