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My car is a 67 and had to install a push button start to it. The factory key switch drops the ohms across the switch from run to start. I don’t know what year they changed that. You can install a GM key switch or add the start button. Ask Chris about it when you order he will know what years do that. Just so you know when you try to start it and don’t have to tear everything apart trying to find a mistake that was never there like I did.