Hola, compaņero b377 -
xxx
The wing glove panel was an aerodynamic improvement that appeared with the 720 initially, and was soon offered to the 707-100. It was a different profile between the leading edge from inner engines, and the junction of the wing to the fuselage.
xxx
Did not apply to the 707-300, having a completely different (larger) wing.
xxx
Happy contrails