Remove line between surfaces

Hi guys does anyone know how to remove the black line between the surface loft on the top of this part and the normal extrude boss base for the remainder? I only want to remove it because I have to make a design on the front and it look bad with a line running through it. I have tried fillet but it only adds two different lines to the face. I know you can remove these lines by changing the display settings but I want to remove it permanently? Any suggestions?

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