Here is a nicely preserved, low mileage base Volare wagon for sale on EB. It's got the standard Super Six, automatic, and A/C which is nice. Very clean. Not easy to find any of these any more.
1978 Plymouth Duster VOLARE 1-OWNER 225 SLANT 6CYL SUPER SOLID ORIGINAL WAGON | eBay
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Nice base '78 Volare wagon