Well. I'm wide tracked and I had to take the hub off and 2 of us to push it all back together.
Just confirm what you're using there. I suspect you have a driveshaft from a car with a rod-change gearbox . These are longer because the 020 gearbox is narrower than the 02A, thus the driver's shaft is about 10-15mm longer.
I would expect what you've done is pushed both CVs in to their limit. This is likely to give you some REALLY odd handling issues and the end of the driveshaft will batter the hell out of the flange when you corner.
In my view you need 02A gearbox and the front mount off it, plus driver's side shaft off the same. The passenger side shaft is the same for 020 and 02A.
The question here is whether the rear engine mount combination has a different height G3 vs G2. They are totally different arrangements: the G3 is a tower, the G2 mount has two brackets either side of the mount, at 45 degrees. The G2 'G60' mount also bolts up with three bolts on top and the G3 has a single bolt. The rear bracket on the gearbox is the same through all, I think.
If I'm honest I would be surprised if there was a height difference in the rear mounts, UNLESS there is a difference in the gearbox rear mount.