Re: 78 Air filter replacement
It's been awhile since I've seen one of those, but I THINK it's the correct filter for your vehicle. As you surmise, it was an expensive filter even when ACdelco made them new because of the metal housing that came with each filter. I do remember that some of the aftermarket filters used to sell a filter housing that, once purchased, would separate into two halves and they would sell you the replaceable paper filter at a substantial savings. It looks like that setup has been discontinued.
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