I still pronounce it like lark, and I don't intend to change.
quark rhymes with ark, bark, dark, hark, lark, mark, nark, park, stark.
Idaho/Utah, though I developed various pronunciations from early reading rather than hearing.
Midwesterners and New Englanders are probably more likely to hear and use the "lark" pronunciation in the word. (And the James Joyce explanation needs to take into account that Joyce, being Irish, would have pronounced and rhymed things a bit differently from an American).