67 Dart, no lights

Hi, New to this forum and Mopar A bodies! I recently purchased a '67 Dart (cloned to '68 GTS with 6.1 Hemi installed) I have discovered that only the headlights and turn signals work on the car. No tail or parking lights, no brake lights, no dome light, no dash lights, no hazard flasher. While obviously there is aftermarket wiring for the engine transplant and fuel system, it appears lighting system follows original format. So far, fuse box looks OK, but no power going to brake switch. Just looking for ideas of where to start before doing difficult replacement of headlight switch, ignition and/or TS switch. Thanks in advance!