1983 v20 cuddy O/B restoration

Help!
Everything is going great on my restoration except for one thing- the bilge from the bow and center of the boat will not drain to the stern. I have cut an inspection hole in the bottom of the center well and found a solid bulkhead in front of the gas tank with a PVC pipe sealed through it running from bow to stern. Where did the water from the cabin and center well drains go originally? What was the purpose of the pipe? How can I fix it? Enquiring minds want to know.