The 1983 Chevrolet El Camino used a stock 14 inch wheel with a P205-75R14 tire.
Original tire size was 215/70/14 on a 14" rim
Doors from a 1978-87 El Camino or GMC Caballero
Any 1978-87 El Camino or GMC Caballero
no
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1959-60, 1964-87
87 octane
Front fenders are the same on, 1982-87 El-Camino. 1982-83 Malibu.
No, El Caminos had unique door designs
In the gas tank.
You can buy a Haynes Manual and it will have the information you need.