Carbs are cake to rebuild especially on the older wh- carbs. If you're pumping the bulb and fuel is pour out the front of the carbs . . . the needles aren't seating (either from the needles being old or the floats not being adjusted properly). Get the kits and rebuild the carbs!! Also you might want to look into the low compression in that cylinder. You probably have a stuck ring . . . you might try decarbing (using power tune) the motor . . . spend a little extra time on that cylinder. If compression doesn't come back . . . I would pull that head and check the cylinder wall for scoring.
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