When you find a hump, clean and straighten the edges. You may have to cut off the excess of the original floor pan it was cut off of, if that makes sense? Sellers usually cut outside the edge to prevent damaging the 4 speed hump itself. Then lay it onto your naked floor pan, and it should fit the contours like a jigsaw puzzle piece. Then trace around the outside edge with a Sharpie. Pick it back up off the floor pan and step inside the line you drew around it 1 inch, and draw another line with the Sharpie all the way around the inside of the first line you traced, That inside line is where you now cut the hole. Be careful not to damage the torsion bar cross member when cutting. After you get the transmission in and lined up with the shifter in place, put the 4 speed hump over it and make sure the shifter clears everywhere inside the hole it pokes thru. When you're satisfied it fits, run a few self tapping screws thru it and the floor pan to hold it in place while you weld it. It may sound complicated, but it really isn't when you get it all layed out and look at it. Hope this helps.
