I trimmed mine off with a cut off wheel. The outer and inner fenders are seam welded at the very outside edge where it turn under the car, so if you go to close you risk separating them. I got a little to close in one section but it hasn't caused any problems.
I have a Eastwood roller and it will not work on the Darts and Scamps. Since they don't have the typical wheel opening arches and the wheel tucks. With the suspension dropped my Eastwood roller was still too long to attached to the axle and roll the fenders. That's why I chose the cut of wheel method.