wtf?
Your dad is just giving you some bentely contintental wheels?
DO you realise how much tyres cost for those things? and how much those wheels cost?
Wheels and tyres that have a tolerance to go over 200mph are INCREDIBLY expensive.
are they not also like 12j wheels? If so, not a chance in hell you will get 12j 20" alloys under your arches? No way, it would cost you 5k in arch work to get them under.
Sell them, and you would probs get about 6k for the wheels!