As Steve said get it tested first. When mine was at Carnetix, it was stripped to confirm their diagnosis.
I was lucky I guess in I only had to have the heads skimmed and new bearings plus gaskets etc. Pistons and crank were good so not replaced.
Happy to dig out costs for you but at 2014 prices guess in won't help much?
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Type 25 + 96 jdm sti wagon  sti 05 ppp - gone but not forgotten 
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