No power at all

i recently bought a 72 Scamp with a 360. A few times I’ve gone to start it and there is no power whatsoever. At first when I get in there’s domelight and dash lights but when I turn the key all power shuts off no crank or anything. It will jumpstart just fine. It has the orange ignition control box. I’ve seen on some other post that those are garbage. Any thoughts?