8 1/4 Rear End Question

You can always have a C-body rear narrowed to A-body width.Plenty of C-body rears at the wreckers.I bought a complete C-body rear for $100,with .489 center.I had it narrowed to my specs.You,d be chancing the 8 1/4 with over 400hp.JMO.

Where do you get it narrowed?