Well, that's interesting, there's no aluminum 16ft runabouts shown in any of the listings in FG's library. A couple utilities and a few fisherman, but this isn't one of those.
I think there's 1 Duracraft Duraflite, from the mid 60's shown, at 16ft 3in, but I doubt the twin cockpit, mock fin stern styling was still being produced by the mid 60's. No pix I could find of a '66 Duraflite to confirm that though.....
Keep digging, you might find something.......... Good luck
When you get ready to start working on it, start a Topic in the resto forum and link it in this one, and this topic in that one.