Dash Replacement

I am replacing the old instrument cluster on my 1975 Duster with a custom dash insert loaded with Autometer gauges and I have run into something I did not expect. For those of you who have installed after-market dash inserts, like the ones Rocky Mountain Dash sells; Have you ever run into this:

I pulled the dash out last weekend and began cleaning things up and doing some measuring. When I ran a straight edge down the crease to check if everything was lined up I found that the notch on the drivers side was pushed in about a 1/2". The same straight edge when resting in the notch below the temperature cutout and passing across the glove box blank sat neatly in the notch on the passenger side (see attached drawing).

This is my first Mopar, my son and I building it together, and I don't know if this is the way it was designed or if maybe the dash got pushed in somehow (accident or something??). Can anyone confirm for me that the dash should be straight across or have a bend??

Thanks in advance

Joe O
Fort Collins, CO