hey can anyone help me. i was wondering if an 04 sti block can fit into a 03 wrx motor.

 

Well really I don't believe it will physically fit into a 2.0L lol.
All stupid comments of mine aside...you can do a hybrid motor and many have done so. You take the 2.5L STi block and slap on the 2.0L WRX heads on the block and viola! You have yourself a hybrid motor. If you do a search on here, nasioc, and maybe iwsti you could find out some hybrid info. Here's a link to a guy's journey through it.
http://forums.nasioc.com/forums/show...ht=2.5L+hybrid

Are you deciding to keep the unicorn and just repair it or whats up?

 

Very possible. I'm breaking in my STi 2.5L hybrid motor right now. GST Motorsports did my Short Block swap.

 

Yes. Use the STI short block, and WRX heads is a good combo.