How do you replace a car starter on a 1981 Chevrolet El Camino?

if your wiring from scratch the original vettes had a positive battery cable on the main bigger terminal on the starter solenoid. they woul also have fusable links that feed certain circuits power when ignition like lights horn auto locks brake lights. the s terminal is the signal from the ignition swich that would engage starter when key was turned all the way, the start wire from ignition switch is wired through a safety circuit, for manual transthe circuit is open until clutch pedal is depressed with auto trans its wired through the neutral safety switch. the reson for this is so when you try to start your car in gear it will not engage starter until clutch padel is depressed, with auto if car is left in any gear except park or neutral the starter will not engage. I have seen many people hurt running direct feed to starter. they turn the key and the carlurches instantly into whatever is in your way. do it right