Tyler ,
You can up-load pictures here, and use a link to them when you post. In 66, a 401 was used in the GS Skylark. There was also a 425 used in the big cars, but there was nothing close to a 470. Does you friend have a bored out 1970+ 455 in there, or is it some sort of stroked out 401/425 Nailhead? The stock cast iron 2x4 manifold on the 425 Nailhead had two 600 or 625 Carter AFBs. The 2x4 Offy manifold is said to be restrictive in comparison to the stock cast iron manifold. The Edlebrock B262 is after-market 2x4 manifold most Nailhead guys are after. I have seen one go for over $500 on Ebay as they are no longer in production. Bob Quigg runs a B262 with two Edlebroch 750s in a 66 GS. It runs mid 11s in the quarter at 3300 lbs.
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