just remember that the 1uzfe has a bulletproof bottom end... 6 bolt mains, forged crank, forged rods, hypereutectic pistons... on www.1uzfe.com it says..
"What would a discussion of the 1UZ-FE be without mentioning the 6-bolt main, steel cap, deep crank recess, bottom end. This contributes to a virtually indestructable assembly. The stock bottom end has been known to make almost 1000 bhp on mostly stock parts. With a completely stock assembly and compression ratio (10:1), the 1UZ has produced 600 bhp with 15 bs of boost."
so although the 1jz can make power, so can the 1uz. plus the fact from memory the 1jz has ceramic turbos, you can boost it like you can with the 1uz assuming you go turbo...