Reply to "Information sought concerning the OEM vacuum hose routing for a '73 Pantera engine."

The EGR valve is a modulated valve (feathered), via vacuum from the carburetor's "EGR port" which has a distinct difference from intake manifold vacuum because the vacuum signal at the "EGR port" has no vacuum at idle.  

Thus there is no EGR at idle … none at wfo either.

vacuum

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