:welcome: DavPat, great having you aboard... :thumb:
I presently am rebuilding a 1976 Tom Boy boat. It is a 14' tri-haul and it is converted from its original layout. But mine (bought used of course) didn't have such drains and holes. So I can't answer your questions. You really need to post some pictures for us to see what you are seeing and wanting to know about. You can post pictures by either selecting the attachment icon in the upper right-hand side of the Write Something box and then select attach from your computer where you have the pictures loaded. But mine you, if the pictures are too large, you will either have to use some type photo editor and reduce the size, OR make an account on photobucket and load them to that site and click the IMG (I think) from the right hand side of the picture and copy it and then paste it here. So try and post your boat pictures and we will help you out...