I always heard / sang "love" there. "Luck" just doesn't flow for me, lyrically (for me, at least, to sing). I sing it more like "luh---viz, baby" rather than "love - is - baby", so "luh---kiz, baby" just doesn't work for ME.
Storywise, luck works better than love, IMO. But I'm taking my liberties and going home.
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