The EGR on Fox bodies are internal. It runs through the upper and lower intake, then into the EGR spacer. I'm pretty sure it will throw a CEL, but once the ECM recognizes that the EGR valve is not opening or closing, it automatically deletes its function. Meaning the ECM will not cycle the EGR valve. A block off plate is fine. Or you could block it off between the head and intake gasket surface, or between the upper and lower intake.
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