lewis engines did the crank, head and balance work on the one im selling! (stop saying things i can reply to!! =P)
a hks 2530 is a good turbo on a 20 from all reports, makes 230kw from memory, think danielH had one for sale in tas section
youll also need injectors, fuel pump and a Z32 afm unless your haltech is MAP based
p.s. no engine is bullet proof from limiter bashing