I have a 68 Barracuda, powered by a 367.
I cut a hole between the inserts, offset towards where the carb was, then mounted a Mr.Gasket oval air cleaner on top of the hood, centered between the bulges. Then I sealed the airhorn to the underside of the hood, when it's closed.
Then I raised those call-out inserts as high as I could, with the studs still barely in the holes, and cut more holes in the hood, under the inserts to let the hot air out. Finally, I drilled thru the fake allen-bolts and installed real allen-bolts to hold it down.
That air cleaner is just two oval alloy plates, and a matching paper oval air-filter. On rain days, I install a KnN oiled filter. Sometimes I stack them cuz I like how it looks.
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This was part of my strategy to stabilize my underhood temps. I can now run at a solid 207*F coolant temp, with unwrapped headers, a 750DP on an AirGap, without fuel issues of any kind, and using 87E10 fulltime.
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Plus, you know, the car goes 93 in the Eighth now, with a little 230/110 cam; so it's making pretty good power.
ok hang on, just so you know;
I'm using a Commando 4-speed and a GVod as a splitter, so, I hit that 93 in Second-over, having used up four gear ratios. My powerband is about 1300>1400rpm