looking for 67 and newer A-body measurement

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I borrowed this picture but it shows the upright area to measure from side-to-side. Where the end of the board is touching is the metal part to take the measurement from. It could be as far to the rear as the lip on the firewall. The front could be six inches back from the core support. Just say where you measured so I have some idea what I'm working with. My wife says I speak English but she doesn't understand me. Sorry for the drawn out explanation. If I could post a drawing, it would be much simplier.