12:05 Garage- ’70 Duster build

i used an explorer 8.8 in my 68 valiant. i bought a second 'short side' half shaft from summit SVL Drivetrain Products 2022636-1 SVL Drivetrain Axle Shafts | Summit Racing which as you say makes it pretty much A body 8.75 width. as well as lsd and disc brakes, they also have bigger 31 spline half shafts so nice and butch. plus with so many fox mustangs being raced parts are readily available and more importantly cheap compared to the 8.75 axle. like pricing a small or big block chevy rebuild compared to a small or big block mopar, you get the idea.
my valiant had 8 1/2" slot mags with 295 50 15's under the stock arches using the 8.8 with the 2 short shafts. i rolled the arch lips but that was it.
neil.