Blaze's AE86

[banpei]

I think the most relaxed country in Europe is the Netherlands. So long as the paperwork is all fine, the car is in good shape (e.g. would pass normal inspections) and obeys the Dutch registration laws of when it was produced (e.g. 40 year old laws) it will probably pass registration. So even with aftermarket parts, modifications done (e.g. roll cage installed, megan tie rod ends, etc), it would still be possible to register the car as long as it's road worthy. Of course, the more you deviate from stock, the more strict the inspection will become.
There is one more tricky thing: to get a car registered in the Netherlands, it needs to be imported and importduties and tax (VAT) have to be paid. However, this does not account for secondhand cars obtained from another EU memberstate. Since yours originates from either Germany or Austria (depends on the last registration) you would not have to pay these duties and tax.

Germany has also become a bit more relaxed lately, especially since the German Whatsapp group collected all sorts of documentation on various aftermarket JDM parts which then helps to get it through Tüv as well. If the last registration was in Germany it probably is easier to register in Germany. I think it would be best to contact Hama86 as he is the owner of the German Whatsapp group and he can help you out with the German rules and such.