new w2 closed chamber heads

I have long valve open chamber econos with a pedistal, and you have to use the offset rockers. I dropped a set of ProComp BBM rockers on these heads, and It looks like all I need to do is use a SBM shaft, with a few shims to make them work. The ports are supposed to be the same, and both heads are considered econos. Closed chambers are race heads.

http://www.moparmusclemagazine.com/..._offset_rocker_heads_configuration/index.html