If the rear end has been swapped in by somebody at a time in it's life, very common to weld on new perches at 43". What I'd be asking is what is the width from backing plate to backing plate. And is it small bolt pattern. You don't want to pay "A body 8.75 price" for a B-body with relocated perches and is a little wide. I'm in no wise suggesting the rear end isn't original, just say'n before you make the trip...
