73 left me stranded

as far as i know its stock. except for the distributer that i pulled out a dodge van at the wrecking yard. the carb is a carter 2 barrel that looks a little different from the pictured ive seen online. the accelerator pump to be exact. my dad suggest checking the flow after the pump, before the filter. hes an old mopar guy. have the horn from his 69 road runner waiting to get put in this dart. i know i have to rebuild the carb, but to me it seems more electrical then fuel. the alternator gauge never jumped around like that before. lights didnt seem dim or brighter upon acceleration but gauge did dip to the low end every time the emergency flashers would flash.