From experience, a 20V is like a slightly more powerful 100kw 4age that likes to rev, and a 4agze has loads of torque down low.
I have done a 20V conversion to an ae93 SX corolla, and also a 4agze into an ae92 CS sedan. I like the GZE a lot more than the 20V, its great not having to change down a gear whenever you want to accelerate...
As a bare minimum you will need to do something for the fueling, what I did was grab an EFI tank/pump/lines from a wrecked corolla for $100, and it works perfectly with my GZE.
Get a frontcut no matter what you do, and things will be fairly straightforward...