Tallest front tire on a 71 Duster

Im trying to find out what is the tallest front tire I can fit on my Duster so I can order them. I have not cut my fenders at all. We had to do that to our Dart to get a 28" tire to fit. I know that the Duster wheel well is a different design, but I dont know if thats a good thing or a bad thing. I already have the rims, Aluma Star 2.0 15x3.5 and im running 4.5" bolt pattern and the SSBC disk brake kit.

Any thoughts would be appreciated