Here, I took your post and broke it off into it's own thread. Please keep your questions related to this topic in here from this point on.
Now as for your question, no, you can't easily swap a B18 into this chassis (as AAAHVTEC noted), and we would not recommend that you try it. The only real options for achieving a significant power increase on your car would to add a turbo setup (not cheap) or to swap to a K-series engine (K20, K24, etc., also not cheap).
There is no "cheap" way to add a large amount of power your existing engine. If there was then everybody would be doing it...