Rear width/mini tub?

i have a minitubed dart. has a 440.stock width 8.75. i should be getting my
15x10 with 7.5 in bs weld draglites monday.going to mount my 29.5x10.5Wx15 m/t slicks on the car. these tires are 12-13 inch wide of surface. i can email u some shots of it next week when i get them on along with some trunk and underneath shots if you would like. or feel free to road trip up hear and hang out.. here is a couple shots for you smallblock