It seems almost impossible that a player from 1974 is still missing in color, but it appears to be true that Rule V pickup by the White Sox, Bill "Bugs" Moran.
Earlier on this thread, two B&W photos, most notably a head shot, were posted for or by the moderator (tnfoto). But currently on eBay there's this B&W McCarthy postcard (among many) by the seller sports-mags that is totally different from the other two.
Ah, but here's the rub: Brace also shot him, in color, under his given name, "Carl Moran". The master Brace checklist shows former Angels and Indians second baseman as William Billy Moran. Also it is specific that Carl Moran is pictured with the White Sox. So if he's in color in the Brace files, perhaps "Carl Moran" is out there somewhere.
Also looking for 1974 White Sox color of Ken Tatum and Jack Kucek, who has been posted only in his small, cropped, oddly colored rookie card photo.