I have a new team in Yankee 56, a stadium I am trying to learn. The offense strategy rule is to have 4-5 LH even power hitters with RH OBP hitting to support. I had a poor draft, but manged to get Snider, Williams, Cash and Haller all w/LH, even Power. Which leaves me with RH needs. I chose Clark over Ennis.
My experience with Clark is that he leads every league he's in- in on base against RHP and is over 400 against lefties. He'll hit over 50 bangers with tons of RBIs. Negatives: Price, which is negated in a 100 mil league. His defense in RF [3e3 (0)] is average. He doesn't hit for average, (if that matters). And he gets hurt from time to time.
Here are his numbers in Fenway 46:
http://fantasygames.sportingnews.com/baseball/stratomatic/atg2/team/team_other.html?user_id=824&stats=splits
Regardless of the park, these numbers seem to hold up. If you need RH OBP with plenty of power both ways, Clark is your man. I think he's a great # 2 hitter if you have a loaded lineup.