Dave Kingman and Dale Murphy > Parker
Dave Kingman was a pretty terrible player. Awful fielder, couldn't hit for average or get on base, didn't run well...basically, all he did was hit HR's.
Parker was a much better player than Jim Rice. Better pure hitter who won multiple batting titles, better raw power, when he was young he could steal bases, and he was a far far superior fielder, who like shag mentioned, may have had the most powerful throwing arm in recent baseball history. And for a feared slugger, Parker didn't strike out much.
Rice couldn't run, was a terrible fielder, and has one of the highest GDP% in baseball history. He was more consistent and durable than Parker. Parker got hurt in his prime, and while he managed to come back at an All Star level for the Reds, and was a very useful DH type late in his career for several teams, he was never the same type of all around threat that he was with the Pirates in the late 70's.
If you were starting a team and both guys were 21, you would take Parker without hesitation. If he hadn't had injury problems, he would have cruised into the hall of fame because from ages 29-34 he lost 4 or 5 prime production years before his "second" career.