1970 Duster, Trans-Am-inspired "Pro Touring" build

Any issues with the front fenders with those wheels and tires? Clearance to the frame and UCA ok?

Hate to bug you again, but didn't see anything about that when I re-read your thread (not that I couldn't have missed it).
No worries, happy to answer. I got some guidance from @72bluNblu on front tire size, they fit like gloves lol. No rubbing at all. I do have a touch of rubbing in the rear on the fenders with the 18x9" standard-offset Mustang wheels and 275/40ZR-18 Continentals even after folding over the inner fender lips (read: smacking with a 2-lb sledge lol). Note I swapped a 1967 B-body 8 3/4" into my car as well. Tires are pretty close (<1/2") to the rear leaves as well so that's about the max width that will fit in the rear on a Duster/Demon/Dart Sport.

From my experience previously running 215/65-15 in the front, those actually did rub just a hair on the fenders at full lock. Tire diameter seems to be the limiting factor on these A-bodies more so than width. Also going with 18s as opposed to 17s give extra clearance to the upper ball joints and allow more wheel width towards the center of the car.