I used that exact kit in my 74, and it was a lifesaver. My dad thought I was going to RotoZip my dash to death, but the metal plate works really good with a permanent marker to make a template. Make sure that you are extremely careful with how you cut the plastic bezel, though. Mine cracked and burned when I tried it with the RotoZip. I still haven't figured out what the best way to cut that thing with would be. It would have to be low-heat and sharp as heck, like one of those car model cutting knives (zacto blades, i think they're called).
-Mike