Sure does, you would be best to move on over to the square body board. This body style ran from 73-88. Looks like you have a lot of work ahead of you on a rust prone truck.
http://67-72chevytrucks.com/vboard/forumdisplay.php?f=4.
In fact '73 was the first year of the 3+3 crew cab in both 20 and 30 series trucks. Here is a picture of a 73 GMC.