Widest wheel with Mopar offset spring kit on 68 Barracuda

I have them using stock type hd springs on a 71 dart and run a 28 by 10.5 slick, dont know offset of rims, inner tubs needed a lil banging, outers fine. If I use a different inset rim Iand ss springs im sure I could go a size larger ,on your barracuda I would definitely use them as your car has a shorter wheelbase and they will jack the rear up a few inches and allow more outer clearance . I ran a 50 series mt sportsman on my 67 barracuda and think I could have went larger. I currently run weld rims dunno offset, hope this helps a lil