Hello, i´ve search the entire forum and saw a few builds or trying to build 2.2-2.3 engines to achieve those figures but most of members normally go custom, i wonder if anyone ever measured and tried OE pistons from Peugeot, probably it wont be usefull and worth checking i guess!!!
Let me leave you with a set thats on ebay, then again you probably could sort that out in uk aswell!!!
http://www.ebay.co.uk/itm/Peugeot-504-V6-604SL-TI-R-30TS-Volvo-246-88mm-Pistons-Liners-Chemises-/251723405784?hash=item3a9be259d8:g:mPEAAOSwn51UaHKy