how do i install a chrome box

I don't think any boxes you'll find for sale are 5 wire, therefore 3 wire ballast should work. If it starts and dies, you may have disturbed the "run" circuit. The "run" circuit goes dead during cranking and the bypass (usually brown, to the coil side of the ballast) causes the engine to fire.

Turn the key to "run" Go out with meter and or test lamp and see if you have power at coil +. Should have somewhere between 6 and 10V. Measure coil NEG. Should be low, perhaps 2V or less. That shows the box is grounded and drawing current through the coil, which you want

The ballast wiring IS NOT CHANGED when converting. In fact if the box goes bad, you could unplug it, replace distro with points, hook up the coil primary wire, and run it.

The power lead from the ECU hooks to the "high" side of the ballast resistor, that is the "key" side.