Re: '57 Stepside, Big Window Project
Those holes are probably the original factory jig points. Factory assy manual, or the document in my signature link both have detailed frame dimensions that might help.
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread
1964 Chevelle Malibu w/ 355-350TH (daily driver)
Helpful AD and TF Manual Site Old Car Manual Project
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