Nope....no one got these heads except a few select in Japan
For the $$ that it will cost to build a 600hp L28ET...you can buy a 2JZ drop it in and have plenty of cash left over for a vacation to Japan, but a nice R32 GTS-T and ship it back..
I am not sure how much $$$ you have to spend but here is what I figure:
1) Custom intake manifold with individual throttle bodies - $1200
2) Custom exhaust manifold - $1800
3) Turbo and external wastegate, BOV - $2200
4) Standalone Engine Management, ignition + Gauges - $3000
5) Injectors, Fuel Pump and Fuel Regulator - $1000
6) Extensive (port , polish and re-work) Headwork - $1500
7) Custom cam, new rockers, double valve springs - $1000
8) Custom Forged Pistons Swain and Teflon coated + rings - $1100
9) Custom Forged Rods - $800
10) Diesel crank (used) - $350
11) HKS Metal Head Gasket, all Gaskets, - $250
12) ARP Head studs, rod bolts, studded bottom end, FWheel bolts - $250
13) New oil pump and timing chain, sprockets - $250
14) 11lb Flywheel + Clutch - $750
15) Intercooler + Piping - $1200
16) Aluminum radiator + Electric Fans - $500
17) Competant machine shop to hot tank, bore, plane, assemble, clean, line bore, etc - $1800
18) Dyno Tuning $750
19) Tranny that can hold this power - Who knows?
20) Pay a shop to put every thing together, wire up gauges, standalone etc etc - $2500
21) Earls fittings + Oil Cooler - $1200
22) Misc (About 5% of above list from 1-21) - $1100
TOTAL - $25,000! not counting the tranny
or on other words the price of a Twin Turbo Supra or early model Porsche 911 Turbo..if you can do it...go for it
like Jeff said open your pocket!
Yasin