I promised to take you through these pans. This is the drivers side and I've got it down in the groove good.
In this picture you can see the floor pan is raised up a few inches. I used these 2x4's to hold the pan up in the center of the hump. That way I can get my lip down in by the rocker panel better. It wouldn't go down flush by the rocker panel until I tilted the whole floor pan up 3 or 4 inches, I put the 2x4's by the hump to hold the panel down in the groove to get the outside screws in so it's flush with the rocker. After I got the screws in the rocker area, the pan naturally lays a couple inches high by the hump.
This is kinda how I stuck them in.
It's hard to see here, but the floor pan is tight to the rocker all the way down.
This is something you need to watch for, make sure your other pan grooves will line up when you start screwing it down. In the center of the screen you can see how nice it matches up.