1.7 R/T Rockers --- Pros? ----- Cons?

Hi All, Been reading posts on here about using the 1.7 rocker from a Dakota R/T but seeing mixed reviews. Answers I'm looking for are:

1 - Is there a performance improvement? (I've read 10HP gained in the 5500 range)
2 - If so, are there geometrical issues that need to be addressed using a stock cam?
3 - How large of a cam has anyone used with the 1.7 rocker before headwork is required?

Thank you A-Bodies!