mk3 ibiza is essentially the same as a mk2 golf, so rallye or synchro floor pan could be fitted quite easily!
A haldex 4wd system would be more complicated, due to mk4 golf / a3 floor pan being different.
I did have an rs4 engine, which i toyed with the idea of fitting to a mk2 golf.
It would have lined up with front drive shafts ok, and JUST fitted behind the grill, but no room for rads, intercooler etc. just required older quattro rear end.
I've got an rs6+ 480hp engine but it is so much longer (only an extra piston)
The only thing with a bonnet long enough woul be an early ur Quattro, if i could think of any thing else it might fit in, i'd use it!
I have toyed with the idea of mid mounting it in an
ibiza, using a passat v6 fwd gearbox (heavily strengthened)
Any one fancy a rear wheel drive 500hp
ibiza??