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Okay, bold and underlined italics scare me, but my Parts and Illustration catalogue lists only one cover for all big blocks 65-74: #330850
Can't vouch for the part number as being original; it could be a service replacement part number. My catalogue is the 1983 edition and #330850 may have been all you could get by that time.
Last edited by Easy Mike; Aug 30, 2012 at 04:15 PM.