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............I bought one of these guides a year ago or so and it's fairly good with additional detail with these:http://www.ebay.com/itm/1966-FORD-Technicians-Manual-THERMACTOR-Emission-System-/161782784806?hash=item25ab016326&vxp=mtr&rmvSB=true
So the scoop is a cover for the relief valve on some air pumps ? I should be more specific would it be on a 67 390 ?