Before buying I recommend looking at the revenue site and entering the details of the vehicle to find out what the VRT is going to be.
I was going to get an 88 golf for daughter which would have cost £200.00 with years MOT. Expected to be taxed at 25% max €50 - € equivalent.
The revenue place their own value on the vehicle - in this case they valued it at € 600.00 and the VRT was €300.00 +. So that plus the road tax and DOE inspection (MOT is not recognised you have to get a DOE cert which is fair enough) would have meant somewhere in the region of another € 600.00 or so on top of the purchase price. Can't remember exactly what the road tax and DOE costs were the value and VRT though I will never forget.
Good luck with it anyway