AlaskanProtege

OK so i understand that a 2.0 or 2.5 head will fit a 2.2 block, matter affact their all pertty much interchangeable minus the gaskets. but i have heard of major compressions drops if u use the 2.0 head... so im looking for someone thats knows what they are talking about. I have been researching valve lift and others critical items. But i wanna hear from someone that has already done it. I Have a 1998 buru Preza L. Its my wifes care and she has been nagging to get more power. "after a got my 06 preza" So im thinking of getting a new short block 2.2 and slapping some 2.0dohc heads on there. Also i am trying to convert my 2.5sohc into dohc with wrx heads. so i need to know what im up agenst so i dont %$#^ up. I have been a tech for 5 years and been playing with motors my whole life. but there is nothing better than personal experience. so if anyone has any info, help a fellow buru junky out.