I'm in the process of restoring the inteior and I found holes in the bottom of the dash also. Mine had two under the steering wheel, for the cover plate, two under the heater/air controls, to mount the controller, one(small) hole for a ground? If you have more than that, someone, somewhere mounted a lot of radios/ CB's, equalizers under your dash?
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LIFE AIN'T EASY WHEN YER FAT AND GREASY!
GMC= Got More Class!
 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.
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