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Old 06-23-2003, 01:05 AM   #2
gchemist
BAD BOW-Silverado XST
 
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Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
From www.mortec.com
14016379...350...77-79...2 or 4 bolt.

Head casting probably
3998997....78-84...305/350......76cc chambers
You'll need to pull of the valve covers to be sure.
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