#1 - The valve covers are not made by Barton. They are Stage V products branded as Barton.
#2 - I have them in an E-body with a Debivec k-frame.
#3 - I had both inner fenders cut and rewelded. A V-cut with a horizontal slice above. Weld up the shock hole, redrill stud hole approx 1 inch toward outer fender. Still close, but clear. I did my homework before I specified those covers.