1AW80 = 2 door pick up.
74V = Trim code, dark Carmine vinyl
03 = Paint code, my book does not list which color, though.
0542 = This would be the accent colors or striping and again, my book fails to list it. My book is the Catalog of Chevelle, Malibu and El Camino ID numbers 1964-87, from the Cars&Parts Magazine people. Hope this will help a little.