Does anyone know if any 60s came from the factory with 348s? If so can you determine it from the VIN or any other code on the frame?

Yes, the 348 was available in the El Camino. There were eight different engines available for the 1960 El Camino.

235.5 cu in "Hi-Thrift" in-line 6 cyl 135 HP
283 cu in "Turbo-Fire" V8 170 HP
283 cu in "Super Turbo-Fire" V8 230 HP
348 cu in "Turbo-Thrust" V8 250 HP
348 cu in "Super Turbo-Thrust" V8 280 HP
348 cu in "Turbo-Thrust Special" V8 305 HP
348 cu in "Turbo-Thrust Special" V8 320 HP
348 cu in "Super Turbo-Thrust Special" V8 335 HP

The VIN number does not show the engine size.

:mrgreen: