Hi and welcome to the club.
Sadly i think your going to need new pistons to get that sort of compression
as with the FTO's standard 0.3mm head gasket and standard pistons you have 10:1 compression
and your not going to have a propper gasket and get 12:1
I can get you 6 pistons,pins, locks, contact reduction grooves, pin oilers and rings €825 + Vat
These can be custom made for your compression.
With optional Carrillo rods with 5/16" CARR bolts for €282 + VAT
Would it be possable to skim the head back enough to raise the compression?
And then get a custom made head gasket made?
http://www.ferriday.co.uk (Micks the man in the know there)