THE AVENGERS STARRING SHANG-CHI, MASTER OF KUNG FU #42
Cover dated July 6, 1974.
Don't quote me on this but a lot of these covers appear to be either John Romita or Sal Buscema pencils at least. Best guess: Ron Wilson and Mike Esposito.
Gifford tells us that this comic began on the 22nd of September, 1973 and ended on the 14th of July, 1976 for a total run of 147 issues. It then was re-titled, simply, Marvel.