Rally wheel help

I'm not near Hemidenny, but I have 15" x 7" steelies, w/4.25" BS, on my '67 FB Barracuda.
No issues with any kind of interference up front (10" drums, 215/70/r15's).
Out back I needed to add longer studs for use with a 1/2" spacer (10" drums, SS springs in factory location, 275/60/15's), to move the tires away from the springs.
Hope this may help.