What about a T3/4?
Turbo has a 360 degree thrust bearing and gapless oil control ring fitted and you can either have a normal .48A/R cosworth type exhaust housing or if not a .63 Mountune fettled housing with enlarged internals and flowed wastegate passage and enlarged wastegate penny too.
If your interested send me your email and i'll send you a few photos.
Cheers.