More money then you will be willing to spend. I looked heavily into this and came to the conclusion it would be cheaper to buy one already converted to 1JZGTE. Due to 'drift tax' these engines and gearboxes are very pricey and/or thrashed.
Lexuspat over at OJC is having a batch made up. Be an idea to message him. He's having 5 made up, 3 have been snapped up, he's willing to do 10 if he has enough interest