Yes. They both use the A340E. Which is different than the A341E, used in the LS/Celsior. The A340E uses different gearing and valve body, but is similar to the A341E.
Really not a good idea unless you have a transmission malfunction. Check/change your transmission filter, and add a few quarts of Toyota ATF-III.
toyota t IV
Yes
How do you install a oil pan gasket on 1995 Lexus sc400
I use the Denso plugs in my SC400
Yes they will
I believe there might be clearance issues along with transmission mating difficulty. A swap gaining popularity is the 1uzfe 4.0 liter all aluminum V8 from the Lexus sc400. There is ample information available on pirate4x4.com
You can reset a maintenance light on a 92 Lexus SC400 by disconnecting the battery. Leave it disconnected for 10 to 15 minutes.
Yes you can.
250hp @ the crank
5w30
Yes