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Brad, First up; Where are you located as that will influence the cost of trying to do this. 400NA isn't easy. That's a 62% increase in power from an engine that doesn't do well with N/A mods. The 6 speed won't be cheap and I would guess you would spend 10 times the value of an LS400 to get...

Google 1UZ fan bracket and they will turn up. If in the USA they are readily available. The pulley that goes on the idler is available from Toyota.

Some photos of the keepers would help. Do you know if they we installed correctly?

There is a cover normally bolted to the transmission. Just make up an alloy panel to fill the void.

No. The sleeves are not thick enough to bore the engine to any appreciable degree. Re-sleeving was done about 10 years ago but is difficult and expensive. Search for posts by Lextreme around 2010 as he was into it then.

400-500HP is a big ask without spending heaps of ash. 700 is spending serious amounts of cash. Turbo charging will get you horsepower cheaper than supercharging but less torque and I guess torque is what you are after. A 1998 engine will need new rods straight up and forged pistons to go with...

I think you will find the belt wrap on the crank pulley may not be enough. It could lead to belt slip when the air is on, turning a corner and the alternator working a bit hard such as late at night in the wet. The perfect time for that to happen. it won't stop the engine or car but will...

350 at the treads is like 475 at the Flywheel. You're asking for a lot. Supercharging won't get you there without huge expense. Think intercooling, new pistons, possibly rods and stand alone ECU. Turbo would get you there reliably and for much less money. Still need intercooling but no...

I would think the 2nd set are the ones to get. They list the DET engine and that tells me they will see more compression than a standard RB.

To my knowledge the ECU will swap but check the part number on the ECU. here are some odd combinations that won't work. Check the number of pins and plugs on the ECU. I would get the igniters and loom tails, air flow meter, ISC and Fuel pressure regulator.

Looks like an SC400 pan. It "could" be welded but I'd track down a replacement. Sorry should add and hour would swap it with time to spare.

Why not apply heat to increase the centre bore a bit. That's how ring gears are fitted. I'd pop it in the oven at whatever temp is recommended for ring gears and let it sit at that temp for an hour of so and then slide it on. Personally I wouldn't use it as the mounting is suspect on a 3s-GTE...

M90 is too small for a 1UZ if you want more then 5psi of boost and even then the intake temps will be ugly. I ran a W2A intercooler and Meth Injection at 21psi to get my numbers and that was ater spending more on the engine than most people earn in a year. I ran an Opcon twin screw blower with...

If you are prepared to use a 6 stud rotor that is the size you want and then use the calliper off the same vehicle you can fit whatever you want. I have Nissan Patrol brakes on my Mitsubishi van and I just made new dogbones to mount the Nissan callipers and managed to go from tiny brakes to big...

400WHP is like 500 at the Flywheel. I spent an awful lot of money on an engine that put out 650WHP and don't see 400 at the wheels as achievable with supercharging. You could get it with Turbos.

Quite often you will find it cheaper to buy another engine and do a swap rather than rebuild an engine.

Could be a plug lead )or 2) braking down under load. These engines run quite well on 6 cylinders until you load them up.

Not all 1UZ's are OBDII. Can you tell us what the came out of and the age of it. If you purchased the engine and don't know what it came out of the spark plug leads may still have the production date on them.

13.9 Is quite acceptable. Once you drive off from a stop the voltage is more than acceptable.

You could remove the tensioner an tap the pulley of the shaft, leaving the bearing on the shaft. Break out the angle grinder and cut the bearing almost all the way through the inner race. it should then crack the cut and come off quite easily. The bearing is a common size and readily...