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J par is correct, you can screw the hump down too, you just need to cut the old floor away inside it. There are even sheet metal epoxy you can glue it in with too. When I put my TKO in we used sheet metal screws to set everything then plug and tack welded everything then seam sealed it.

An air nibbler works great cutting the sheet metal out, what it can't do Mr Sawzall will cover.

4 speed carpet is different too. I have a newer black one cut for my 69 Dart if you looking for one. I'll make you a good deal on it. It wouldn't work with my TKO raised floor.