Here is an idea for your consideration.
There is a place on these hoods where a hemmed over portion of sheet metal ends and the single thickness of the hood to cowl radius begins. I marked that #1 on the photo.
hood Then I measured 1 inch forward from that mark (shown as #2) and measured across the hood side to side.
It is a little tough to measure since the tape had to be right up tight to the firewall. The measurement I got is 58 inches. Hope this helps.
