issue with AMD Demon floor pan..please help newbie

hi everyone, im Chris im 27 and i have been watching everyone on this site for a long time, trying to learn as much i as can.
my dad has a Demon that has been waiting to under go resoration for a very long time now. i have started to take over the project. I got a amd full floor pan for it, it seems to fit ok except for where it welds to the crossmember.
as you can see from the photo the floor is about 1 inch to high and it doesnt go down anymore as far as i can tell, remember this is all new to me :S
the floor is level along the sides its just here and the cross member that i have this issue. if anyone can help it out with this it would be very much appretiated : ) as i do not want to get discouraged with this project, i want to keep moving forwards, but for right now this issues has me stumped.

the car is a manual, which i dont think makes a differance
PS: i will probably asking for a lot of help over the coming months..years lol :)