Custom Dash for 1971 Demon

I am wanting to do some custom work to my dash in my Demon, and I had a question for anyone who has ever done one before. What angle is the inset part of the dash? I am wanting to cover the portion that the heater and radio went into, and insert my switch panel in that spot. To save myself some time I was hoping someone on here would know what angle to bend the metal at to get it to match the existing angle.