Hybrid builds can get expensive and are just not the normal pull block install fresh block kind of deal. Various things need to be considered, such as the compression you are going to run, which headgasket to use, the conidition of your EJ205 heads, your stock EJ205 injectors will need to be changed to at least 565cc injectors, you will need a good/experienced tuner, etc.
Here is list of the various stuff for my hybrid build (I copied this from an old post of mine on NASIOC):
Basic Hybrid Swap (prices are what I paid back in Aug '08):
1) EJ257 Shortblock = $1850
2) Timing Belt = $150
3) Water Pump = $120
4) ARP Head Studs = $195
5) 2.5L Oil Pump = $150
6) Cosworth Headgasket = $150
7) Shims/buckets or Bucketless shims (depending on block year) = I got mine for free, but normally around $350 (I think).
8) Tune (Dyno + Road Tune) = $500
9) Various Gaskets/misc = $100
Total = $3215 ($3565 if you include the cost of the shims)
And thats if you build it yourself.
If you want to do a little extra like I did, add:
Cams (Kelford 264/264) = $900
CP Pistons = $520 (Forged Pistons are a must IMHO)
Valve Springs/Retainers = $225
Clutch Disk = $145
TMIC = $700 - $800 new, $300 - $400 used (FMIC +$)
Blouch TD05H-18G 8cm w/PnP & Coat = $1100
DW Injectors = $260 - $290 (after $100 rebate)
Walbro 255 FP w/install Kit = $90
Still got to factor in $1500 - $2000 for labor if your not doing the build yourself. As you can see the costs add up very quickly and out the door w/labor you end up paying between $7000 - $8000 or more depending on taxes, labor charges, dyno/tuning fees, etc. Now those prices I posted above may not be rock bottom, but that is what I paid and was back in August of '08 before the economy really took a ****.
Hope that helps you out. I think that is a fairly complete list. Oh and here is a link to my dyno chart if you are interested:
(very conservative tune at 16PSI on a dynojet)