If the link by @dchisholm does not lead to a correct footprint, you have a few options.
If any of these footprints has the correct pin spacing, drill diameter and pad sizes i would take this footprint and just edit the fab and silk layer to be correct.
If there is no footprint with completely correct pads, i would create the footprint from scratch. (is a lot faster than to edit 78 pads)
I would set the user grid up in such a way that you place two of the pad rows with one setting. (Then move the grid origin and do the other half.)
Sometimes it helps to place all needed pads in one go to some place outside the footprint area and later move them to the correct place with the grid trick. (Kicad always sets the pin number of newly placed pads to the next free number.)