Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Have always had great experience with Walker Dynomax's, been installing them the last 2 decades. Years ago, for my own projects I'd order the 2 1/2" inlet/outlet Dynomax CVX 17205 mufflers (aluminized version of the same size stainless Ultraflow), then I started ordering the Dunomax 17449's. Both are a 20" case size muffler. Personally, I don't need a stainless construction muffler, the aluminized Dynomax's have always held up fine, their flow is excellent and they're not obnoxious like so many box mufflers.
For a stock smaller diam headpipe, most likely what you have under your '67, I'd go with a same case length Dynomax, but with a 2 1/4" inlet and outlet. you can ck Dynomax site or Summit, for exact part number.