You're going to have a problem. The image size, 3008x2000 is not an 8x10 format. The first thing I would do if i were you would be to (in photoshop) go to the menu (at the top) that says "Image" slide down to "Image size..." and in the dialog box that opens set the resolution to 300
After that, choose the crop tool. When you do, you will notice that the top bar of the photoshop window will change and you will have three boxes that you can put data into. put "10 in" in the width box, "8 in" in the height box (without the quotes)and finally 300 in the resolution box and then the crop tool will only crop an 10x8 landscape image. reverse the numbers and get an 8x10 for portrait image, or use the little double arrows to switch width and height.
This way you will be able to see what must be cropped.
all of this is due to the fact that 35mm is not an 8x10 format.