Hi Guys,
Here are some shots of the cowl plenum duct off my 68 427 Impala.
For some reason, the metal A/C base in your pictures looks different from mine. I will get it out later and compare it to your pictures.
Steve
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Steve
68 SS427 Custom Coupe 427/385/M21/3:73
68 Impala Custom Coupe 427/425/M21/3:73
68 Biscayne 2 Door 250/3 speed
68 Caprice Estate
68 Camaro SS396 4 speed