I have some pics of my floor repairs that might help you. I did not replace the entire floor pan, but it should give you an idea of what it should look like.
I assume you're installing a complete floor pan, but don't know what you mean by the notch in the pan.

Click on the photo link in my signature and scroll thru. The floor repair photos are the most recent. If you need specific dimensions, let me know and I can measure for you.


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.