kiwirx

I have an RX Turbo rally car with numerous mods and have been running 15-17 psi boost but have finally blown a piston to bits.I would like to increase the compression ratio and reduce the boost to achieve better low down power and less lag ,hopefully giving better driveability.I guess the easiest way would be to use a non turbo carb type EA82 block.Does anyone know if this is possible and weather the internals differ.