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i usually would edit, but beacuse of the nature of my last post i wont...
i would suggest just going with a b18 or b20... either will make a crx fly.. for the f or h series you are looking at major fab work as well.
also try finding a late model crx... and remember that the first gens are a bitch
these motors are your best bet. If your looking to boost the LS motor is gonna give you the best bang for the buck. Im gonna bet your having a shop put this in for you right? Also, I would learn ALOT before you consider boosting