Looking for advice on power steering options with 460/4spd Z-bar with manifolds

[JetDoc]

I'm looking for advice for power steering modernization that will fit without to much modifications. Car has 460/4spdw z-bar and stock 460 exhaust manifolds. It currently has factory power steering setup and steering box cover and inner bolt head has actually been ground down some to prevent touching drivers side exhaust manifold by P/O. I'd prefer borgeson if it would fit, or maybe R&P. But don't want to drop big cash just to find out it won't fit without major mods or won't fit at all. Any advice or hints appreciated.

[Ford Blue blood]

I believe the Borgeson box is a touch smaller then the stock 57.  Never put one in a 57/58 but have in two other Ford produces.  Really nice product and superb tech support.