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This begs the question .... where is his heater box ?
The heater box and associated parts were removed from this car for the installation of AC. All those original parts were gone when the car was brought to me, so I didn't realize that was a stud hole. I am not sure what part of the "ductwork" fastened there though? 
Thank you Kowal for the picture. 
There are three studs to hold the heater box in place, using the nuts with the rotating washers. Two that everyone sees on the firewall in front of the passenger footwell and then the third right behind the driver side valve cover, which is what I think your extra hole is for. Here is a pic with the holes circled.
'69 Hemi Charger 500, ‘70 U code Challenger R/T (These and a bunch others at www.dkowal426.com) P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."
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