Maybe I didn't use the right terminology. You don't have to remove the heater box to get to the inside upper hinge area. Only the controls for it. On my 68 the controls are on the driver's side lower part of the dash. Believe there are 2 or 4 screws holding it in place and then it will slide out. You may have to remove a screw or two to disconnect the cable wire assembly if there's not enough play for the controls to slide out to give you enough room (or you can remove the cables from the heater box - just take note where you removed them from). You'll also probably have to unplug the switch from the wiring harness. On the right-hand side you may have to remove the glove box to get to the inside upper hinge area.
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