Rear Wheelwell Clearancing

Is anyone familiar with how the Hemi Darts and Barracudas had their wheelwells clearanced?

I know it was supposedly a "hatchet job", but I want to roughly duplicate it on my '67 Dart GT and '67 Barracuda.

I read an article in one of the Mopar magazines awhile back where an owner of an original Hemi Dart had or made a template.

Were the Barracudas done the same way and in the same pattern as the Darts?

I want to do a quality job and make it look right. I don't want to make the radius like a box or circle as I have seen done.

Any help would be appreciated, thanks!

Rob