Need tips on radius cutting rear wheel wells

Thanks for the advice guys. I ended up using a sabre saw with some metal blades, measured up how much i would need off and made a template to trace on the car. It worked out really good in my opinion, sorry to the guys who advised me not to do this though! I took into consideration everyone's opinion, but it comes down to the look i have pictured for the car and that's the route im going. I plan on getting a late 60's swinger sometime and I will make sure not to butcher it like this one I have now.