1UZ is tiny for a v8 one of the best ever made BUT VQ eats it for size, tuning, power and parts today
best thing is no need to chase a box as the 6 speed is easily available.
Ive been looking for a 6mt FWD box for a rear engined FD3S brain fart.

There is an FD3S in Japan with VQ35DE that killed it on his first outing with an extra passenger
tagging along. The vq in it is a traditional front engined rwd, torque alone double a rotary.
https://www.youtube.com/watch?v=ZOXHCqFTqls&t=659s
VQ is crazy good these days now there is knowledge on them.