Speaking of the 1970s. . . At least in his Oakland days, Reggie Jackson had a cannon. As strong as Parker's, who was phenomenal. Willie Stargell had a gun, too. In fact, he and Clemente may have been the best LF-RF combination ever, by arm strength. Another '70s outfield cannon was Reggie Smith. Also Bobby Bonds. Next to Clemente, Bonds was the best RF I ever saw.
A really good CF arm was Amos Otis. Possibly the best I've seen, unless Smith was.