sounds like the inner preheat shroud that goes under the drivers side exhaust manifold on RA manifold cars. Tried to post a pic but can't so here is an eBay link with a pic:
http://cgi.ebay.com/ebaymotors/1969-...m230259634468&
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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