bent rotor contact blade

so i changed to an aluminum rad and new carb gasket, 360 fired right up, when i kicked the choke off the idle would surge, then engine would die.would not start after.troubleshooting i found a twisted contact blade on rotor under distributor cap, replaced it, still wont fire.this has happened three times over the past five years. any thoughts how this is happening?
First thing is pull distributor, and see whats worn out. Has to be something. Or a bent shaft. No point speculating, dist has to come out. If i was in the states, i would box it up and send it off to halifaxhops. he knows his stuff. He may have a drop in, ready to go.