Correct, the RPM accepts spreadbore carbs but has the 4150 bolt pattern too. I did lay the opening back and knife edge the center divider to clear the spraybar pattern. I had to gouge and blend the carb pad at the ends of the center divider, so the spray pattern will spray down the plenum.
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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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