:George, You're NOT gonna push 900rwhp through the stock 2JZ repeatedly. Email Peter Blach, he has experience with exactly this. And he will tell you that 900rwhp is the limit, it will only last a few runs at the track(the real world). Did you talk to SW? Last I saw SW's car was forsale witha "new" shortblock. :-) BTW Peter's car is for sale too. Almost every big hp supra that you know about has gone through stock blocks.
Yes, SW did blow his stock short block but he also made 800RWHP dynos and 9 second passes at over 150mph in it. Impressive for ANY car on stock short block if you ask me.