[ford38v8]

Atch, for display only, your idea of JB Weld can produce excellent results. Choose the particular product with care about color for any left visible. Ensure that no burrs prevent a tight fit, groove out two narrow internal trenches on the opposing pieces and lay in JB in conservative beads to allow a full tight fit, each to have small exit ports to the surface to expel excess Epoxy. You’ll know you got it right when you see the expelled product squeeze out from each port.
As for paint if you go that route, consider Rustmort, a one step brush-on that chemically converts rust to iron oxide, while appearing as the color of Red Lead, a perfect choice. Importantly for any paint choice, leave the business end working surfaces totally free of paint.