Since we added more edges at the top of our grill it lost its curvature. which results in a space between the hood and grill. To fix this we will once again use falloffs. Select ‘Radial falloff’ and drag it like in the image with the right mouse button.
If we change views to Perspective, we can check if our falloff gizmo is flat (other wise it will also affect our tool in the third dimension.) Be sure you have your grill geometry selected and activate the ‘Move’ tool. Now move the geometry up until you align the top of the grill to hood curvature.