If we think back to how many 392s that came in New Yorkers and Imperials with single quads that then were pulled out of early wrecks and put into street machines and drag cars, I'm sure that Chrysler was getting enough parts department call for dual quad manifolds to make one last run of them to supply that need. This is the latestest date code I am aware of for the part. Wayne Date: Tue, 09 Dec 2003 22:20:39 -0500 From: paul holmgren <paulholm@xxxx> Subject: This Be Interesting Or Right ?? Claims it is a 57-58 2x4 intake manifold with a 1963 date code http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=34198&item=2447043162 -- Paul Holmgren Hoosier Corps #33, L-6 2 57 300-C's in Indy [Non-text portions of this message have been removed]