Looks right. For those who don't like to do the math, just go to a book and do a fake parlay, trying to match the odds as close as you can to the odds you're interested in - I just used Canbet to do the math for me, on odds as close as I could get to the odds for Florida in Games 6 and 7:
Betting Ticket
Game Selection Points Odds Part Bet Win Del
2 Team Parlay
57 Carolina Hurricanes 0 +193
65 Chicago Blackhawks 0 +150 100.00 632.50
Odds at Pinnacle are +195 and +149, so the +193 and +150 I used at Canbet are almost dead-on, with the Marlins getting around +632 to win the Series after losing tonight.
Conversely, if the Yankees lose tonight, for them to win the WS would require winning -213 with Pettite and -157 with Mussina, so here's another bogus Canbet parlay approximating those odds:
Betting Ticket
Game Selection Points Odds Part Bet Win Del
2 Team Parlay
959 New York Yankees Action 0 -158
109 Michigan 0 -210 100.00 141.05
Here, you'd be getting +141, so Shrink's calc for Florida to be a -160 favorite looks to be pretty good.