World Series Debut: Most HR

At the start of the 1986 season, only one player made his World Series debut with more than 300 career home runs (Johnny Mize: 316 in 1949)
In that '86 Series, the Red Sox had two players playing in their first World Series with over 300 homers:
Jim Rice: 351
Don Baylor: 315

(Remember, Rice was injured in 1975 so didn't play in that series against the Reds)
For Baylor, this was the first of three consecutive seasons playing in the World Series for three different teams. (Twins in 1987, A's in 1988)

It wasn't until 2002 that another player with over 300 HRs made his WS debut. Barry Bonds came to the fall classic with 613 home runs)

In the last 4 years, 3 more players joined this club:

2004:	Larry Walker	368
2005:	Jeff Bagwell	449
2007:	Todd Helton	303

Remember when Ernie Banks was the only 500+ HR player without a World Series appearance? Now there are six.

Sammy Sosa	609
Ken Griffey Jr	593
Rafael Palmeiro	569
Alex Rodriguez	518
Frank Thomas	513
Ernie Banks	512

Not likely that Griffey or Sosa will see the Series soon - but A-rod? Now that he's off the Yankees, he has a chance.