Does anyone have a 68 parts book? I need the part no for any 68 bb housing. Not the casting no. I’m having trouble with the measurements on the lower left thickness of the housing that the power steering pump bolts too. I’ve got a bad housing I’m trying to replace and can’t find one with the same thickness at that point. Mine measures 2.762 which is approximately .060-.080 thicker than all my other known 69-70 housing. I’ve got access to a known 68 that is 2.742. All my other 68-70 vary somewhat. My top mount is fairly consistent on all of them. This one throws my pulls alignment off. Thanks.