OK yet one more request for help. I have welded in a new floor pan and am ready to seal all the seams in the interior. (I removed all of the interior paint and sealer a while back) I have two questions1. There are large gaps in the corners and the back side of the seat support between the seat support and the floor pans are these water runways or should I seal them up two. Cant quit tell in the pre resto pics I took. 
2. Also when I am finished has anyone painted the interior metal with rubberized sound deadner, was it effective. I am modernizing the vehicle and want to keep it as quite as possible? on the inside of course
Thanks again for your great insights.
Rick
------------------
1970 Grande 3.50 9",4 wheel disc, gt40-cobra rims(soon) 351W, Calypso Coral, Severe state of restomod