i've done my conversions over time as well - this one just fits inside NCOP regs.
not much wrong with the 5VZFE - the 3.4L V6 from the Prado - it's just an iron block like the 2UZFE.
i've seen that MS75 - awesome bit of kit but SO not legal in the car of choice for me.
however, i reckon that'd be a nice bit of engineering in an older holden.