Trunck floor gap in my 1969 cuda

I thought I originally took out a crapload of sealer when I took the old one out, but that was 7 years ago, and memory isn't what it was. I saw the pic you have is that your car? Mine is a 69 383 4 speed formula s fastback same sunfire yellow with white interior. I am going to try and post some pics if it, in pieces, soon. I also have a really weird interior optioin that I cant find info on. Have searched for years but never have directly asked on a forum. It has a paisley type material over the deluxe woodgrain on the door pannels and across the dash. I will try and ask if anyone is familiar with it on another thread as soon as i get the pics taken.