Kodak's only 14" Ektar was an f/6.3. Same with the 12" focal length... the 10" Wide Field Ektar is also f/6.3.
Fine lenses, all of them, but not 'fast'.
I've used them all, on the job and in personal work. I've also used the 14-3/4 Ilex that cullah mentions above. An excellent, under-rated lens, sold through Calumet after EK gave up making large-format lenses.
I don't know what you'll find if you go looking for 8x10 lenses faster than that. The more modern plasma types are generally f/5.6, not much gained there. Best of luck!