It routes behind the upholstered cowl panel and down into the bottom of the cowl.Make sure to cowl is clean and there is a gap or hole for the water to exit.
Radiator overflow tubbing is thin wall. Most auto stores only have it in 2-3 ft. Lengths. Get two and go by the vacuum fittings and get a splice to make it longer
Most places I frequent sell it by the foot off of rolls.