Definently a good swap. My friend swapped it in his 95 4dr last winter and the thing halls. I don't see why it would be a problem getting it into a CRX even; it's been done before. But of course you'd have to get a lot of custom work to get it to fit in the engine bay. Definently get better springs. My friend is getting adjustable shocks because the rear of the car pulls down too much when he launches and shifts gears (when he's racing) i believe but not positive; and hurts his 1/4 mile time. And if you plan on a turbo make sure you've got the closed deck block, I've heard that it's a bad idea to turbo the open deck ones.
Links:
http://h22hybrid.20m.com/ Very informative site on the whole site.
http://www.h22a.org Go to the forums area and there is a lot of information and quite a few people who have done the swap.