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Pretty easy because there was no El Camino SS in 1978.
The 400 wasn't available in the El Camino in '78.
Doors from a 1978-87 El Camino or GMC Caballero
Any 1978-87 El Camino or GMC Caballero
187 inches
There were 3 factory installed engines in a 1985 El Camino - the 4.3L V6, the 5.0L V8 or the 5.7L diesel V8.
From 1978-1987
The back glass from any 1978 or newer El Camino or Caballero will work.
Yes
Yes
The model is a 1978
Only as an option.