I think you're quite wise going for the 20v over a gze - that gearbox looks basically unique and I imagine it's not all that strong and as rare as hell. You really wouldnt want the torque of a gze ripping it to bits.
The only real problem I see is more of an aesthetic-technical problem. The engine will be mounted high, making the car top-heavy.
Have you thought at all about perhaps converting it to RWD or East-west FWD and getting a lower centre of gravity?
The other bonus is that gearboxes are easier to source should something break.
Some pics of the rear end suspension layout would be handy to see if there are any similar rear ends with diffs. Thinking about it, a standard 4WD tercel rear end should bolt up no probs. All you need do is leave the front CV outers in and get a rwd gearbox.
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