I had to rebuild mine after I smashed the rings in #2.
I had a 1mm o/s bore, crank / flywheel / clutch balanced, ACL bearings, custom pistons (from Aust Precision Engine Parts, Wantirna, Vic). Got a "mate's rates" assembly, all for about $6k.
You need to be careful about fitting forged pistons. The pistons need to run hot, otherwise you are risking them not expanding enough to give a good seal around the rings and thus burning oil.
And I'm pretty sure it has been stated in a squillion and one threads that the AWD sump does not just bolt up to the RWD block!