There isn't such a setting on the '67 and '68 cars. One thing I sometimes do is move the function lever to AC (leave the fan off) and open th drivers side cowl vent. At speed, some air will flow to both places.
That is good to know. I just got the air flowing out the panels and the defrost by cutting the ends off the vacuum lines and putting them back on. Now the air blows out good.
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