General Maintenance & Repairs - help with this part

i know its a clutch assembly for a firebird/camaro but need to know what year its for or a rough estimate the first pic is the numbers stamped on the back
http://i229.photobucket.com/albums/ee16/gfercaks33/parts%20for%20sale/IMG_0877.jpg
http://i229.photobucket.com/albums/ee16/gfercaks33/parts%20for%20sale/IMG_0882.jpg

Truly, I don't know, but the date stamped on the part is Aug 10, 1974. That would make it a 1975.

Someone on here will know for sure.