4AGE BT is the 20V black top edition (MAP sensor) - using it with a T55 with give you the acceleration you are looking for, it will pull like a "raped ape" who also had wasabi to use as a healing cream. And if you fit velcocity stacks on it - The sound is like music. most other people will let go of their accelerator pedal when the VVT hits and the induction roar peaks. Cant say about cost but it would be quite an amount lower than anything else.
To fit it in RWD, the transmission fits perfect, the clutch is OE Toyota, the only issue is that you will need to relocate the distributor to the front and make two new stainless steel coolant pipes for the radiator. It can be done - just requires some time and thinking to make it work
using JZ series would end up in a cut up car which only does wheelspin in all gears - meaning it will be undriveable.