How to cut out rear wheel wells (radius wheel)

Hey how's it goin, got a 64 barracuda I'm building, I would like to cut out the rear wheel wells, to give it a round appearance.

I'm not to sure how to go about it. If anyone has any ideas on how to go about it that would be awesome. I searched the forum but couldn't really find any instructionals or something like that.

I did find some pictures though if early A cudas.

Alexander bros 66 cuda build with the rounded out wheel well. Some online stuff too, under glass cuda.

Give me a sec to upload photos... My computer is being weird hah