A904 rebuild - boosted W2 408

Few things you need at least:
-Deep oil pan+oil cooler
-HD front band strut
-Billet aluminum low/rev servo

i also highly recommend:

-billet front drum, steel(for street/strip) or aluminum (for racing).
-bolt in sprag, or you should be sure your oem sprag is ok.

Your power goal is so high, and if it´s a pure drag car, everything can go broke, input and output shafts, planetary gears etc etc.
It also requires more maintenance after racing, you must change oils more often and inspect/change the oil filter, and bands and clutches too.

the list is endless