It is really not as bad as it sounds. I had a customer's car blow a heater core after a show and we had the replacement core removed and reinstalled in less than 2 hours. If you are removing the inside box completely I would simply remove the heater selector with it and leave the cables in tack as to me they are easier to remove out of the car than trying to do it in the car and the selector is not hard to remove with the box (in a Chevelle). The other bad part about removing your firewall side box if you do is that you will disrupt the original undercoating that was sprayed there.
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