^^ that might be your ignition switch, but i think it might be the starter relay. happend to me i changed it and it worked perfectly.
solenoid?
starter relay?
battery?
grounding?
fuel going through?
if its the ignition switch, just change it cause i mean its an old car. when you turn the key to on it might not read and sometimes dont start. but if its clicking i mean thats gives the sign of it working. just check those suggestion i gave above.
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