Good news, that's a thickwall block. Last of the good ones before the bean counters took 15-20lbs of cast iron out of the design.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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