#5 MJIC X #4 MORB 90*

That's exactly the application this fitting is built for. Thread B1 is a 1/2-20 male JIC with a 37-degree flare, which is your #5 JIC end, and Thread B2 is a 7/16-20 male SAE adjustable o-ring boss, which covers the #4 ORB port on your valve block. The 90-degree elbow geometry handles the direction change, and the adjustable ORB end lets you clock the fitting before locking it down so the JIC side points where you need it.

This 90-degree elbow is rated for dynamic pressures up to 6,000 psi, so it should hold up well in demanding hydraulic systems.