I am looking to swap engines in my '92 Legacy L (Japanese made.) Which engines fit, and of those which is the best? I definitely want something with a turbo, and I would like to keep a little bit of room under the hood for some extra goodies Any reply is appreciated, but most importantly I would like to hear from anyone who has made the swap before. Pretty much the only reply I don't want is someone trying to sell an iPhone. Thanks.

Also I am swapping transmissions from auto to manual (if that makes a difference.)