Suspension swaps from other cars ?

[Bean]

you can make the Nissan 200sx suspension work on the front... it needs some adjusting though as the nissan lower arms are ~50mm longer.
So either you make sure to accommodate the wider track and run quite a lot of camber and wider fenders or you stay with the AE86 lower arms and make the balljoint fit the nissan spindle. Best solution to get a bit of both is probably a custom lower arm to give more track but not too excessive.
Another benefit of the nissan spindle (s13) is you keep the same wheel PCD and can use their brakes which have a lot more aftermarket support etc..