narrowing a b-body rear

It's your money, but is it really worth the inch off of each side? I guess factory wheels could be an issue, but anything aftermarket with an inch to an inch and a half deeper backspace is gonna work nicely I would think.

I run a 68-70 B rear in my Sport, which is wider yet, and 5 1/2" BS wheels and they fit perfect. Although my wheel wells might be a tad wider.