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In the attached pic I circled the area that is either a solder blob or a raised area of which I'm unfamiliar for this year. The rest of the side strap looks right, including the corners of the strap.My 67 Shelby radiator has a long threaded rod across the mid-section. The side straps have a bulge and hole on each side strap to accommodate said rod. This radiator also has that bulge and hole but no rod. I'm unsure if all SBF radiators from WMO had this rod in 67. The date is too early for your car, but you knew that.
Yes inside your circled area looks like a raised blob of solder which was poorly applied when the side strap was re attached during a recore etc. The missing ID tag that is put there also indicates the previous work. A poorly soldered on tag tag that simply came detached would have a corresponding flattened soldered area underneath which is missing in the picture indicating it was deliberately left off during rework . The support rod is threaded on the ends and secured with pal nuts "shell nuts". The rod is typical on factory smallblock and big block radiators. Of course the big block rod is longer because of its wider core. I have used the big block rod as a donor to cut done and re thread one end for a missing smallblock rod.
Many thanks for your hints so far.I believe it looks like a "bended/stamped hood" done by purpose somehow in the strap itself, not comming from soldering.See pic left side.The radiator indeed has been re-cored some time ago as I could figure out.Missing rod seems to be an issue and can't be fixed that easy I believe not having a source for it.