Ole Car Man

Well maybe I found the right thread...LOL Anyway, I have a 1964 Valiant Convretible, and the top is not attached to the body from the rear-(side)window for about 8",and when it rains the rear floorboards flood? I put the top together (from 2 different tops) and had ashop put the top on, and they had never done a 64 Valiant, so need to know how I keep the water out?
Thanks..........Kelly Pate