an M90 eaton kit from
Jordan Rover Tech on a 3.9L "stiff block" rover V8 will crack windscreens in a sunny from the torque - and will fit with "minimal" fuss if you put a tricke dup 4spd JATCO behind it from M&V automatics in adelaide to name one workshop.
the oil system in VG30DET is fine, it's the VG30DETT where they changed the pump and pickup, leaving it high and dry on hard corners / launches and the pump was a little "soft" on pressure.