71-72 charger diff in A bodie ?

Yeah a 71 B body rear axle is going to be too wide for a Valiant. The ‘68-70 B body 8 3/4 in my Duster is wide already. It barely fit 225/60/15’s on 15x7’s with a 4.25” backspace, which is a factory offset. Even the ‘68-70 rear in a Valiant would be a tough fit, you lose 1” to the quarters vs a duster, so factory offsets would be a no go. The ‘71 B rear is 3” wider than that, so another 1.5” of backspace per side. It’s not worth the the trouble unless your plan is to narrow it.