How much boost you planning to run , I'm running 26psi boost with spiking going to over 30psi in my 165 motor , The parts I am using are ST205 pistons $382 , 205 steel head gasket $98 (both genuine Toyota ) The 205 pistons will give you a little less compresion , Gapless rings $167 from Precision Engine Parts in Melbourne , ACL bearings from Repco ,ARP head studs $190 from Rocket , If you use a steel head gasket you will need to get your block decked and head surface grind , as a steel head gasket requires very flat surfaces .