Paramount Plus has added a bunch of pre-1981 films, including a few (I think) streaming exclusives (*)

PAPER MOON (1973)
CHINATOWN (1974)
THE CONVERSATION (1974)
DEATH WISH (1974)*
THE LONGEST YARD (1974)
THREE DAYS OF THE CONDOR (1975)*
HEAVEN CAN WAIT (1978)
THE HUNTER (1980)*