What year is it most likely??

[1fun71]

my buddy has a shortbed truck titled as a 69 but the bed has no side marker lights so I'm assuming its from a 67. The cab has a foot E. brake and the rightwing window latches for a 69. Also I noticed the frame is alittle different at the front because his headers didnt fit in as easy as my 71. Also his drive shaft almost seems solid steel only like 2 inches thick?? I was trying to figure out what year it was mostly, since it seems it was pieced together. Anyone have any Ideas? thanks.