Rust free 78,300 mile 1978 El Camino

Local vehicle all it's life, o rust, nd straight.78,390 miles. Car sat for several years before I bought it from an estate. Therefore it has a new gas tank, new aluminum radiator, new top end gaskets and filters, resh engine paint and that inactivity helped keep the miles down. 78 was the last year for the 350 4 barrel. The car runs smooth, tops, nd handles like a 78 El Camino. Carhas a crackedwindshield, eeds headliner (board is good, ust glue on new fabric), adio comes on but no sound (its as old as the car you know), ash lights are not coming on and gas gauge stopped working.