We used to run a 10 x 15 with a 5" back spacing with the old mopar offset kit and a 29.5 x 10.5 bias ply. The tyres would stick out of the bodywork 1/2" and we'd have 3/8" clearance (min) to the leafs, this was with an E body width Dana. Street tyres were ok but the slicks would rub sometimes when turning, mainly catching on the spring.
We then moved the front spring mounts to the frame rails and put spacers and longer bolts in the shackles to give everything another 1 1/4" clearance, we also narrowed the axle 1" per side to b body width.
With the same size and back spacing wheels, the tyres tuck nicely under the arch, which was good since we lowered the rear 1 1/2" at the same time. We now use a radial slick which is narrower than its bias ply counter part of the same designated size.
Tyre is still close to the body work (outset) but doesn't rub since the car has plenty of rise in the rear, no rubbing on the springs either.
This on a '74 Dodge Challenger (European Export model if that makes any difference) Anyway, HTH's