Odd ignition and electrical problem

I have a 1970 Valiant , slant 6 with a 3 speed manual , column shift and point ignition. With the wiper switch off , the wipers are on all the time. The only way to shut them off is to disconnect the plug at the wiper motor. Also when you turn the key to off , the engine stays running. The only way to shut the engine off is to let out the clutch with the car in gear , and your foot on the brake , of course. With the engine then off and the ignition switch off the oil light stays on. Anyone have some ideads? Thanks!