Here's an interesting fact about race as class that people not very familiar with the LBB might not know.
>race as class was an invention for basic D&D, and not how the original rules did it
>the original rules simply limited dwarves and halflings to being fighters, and elves to choosing to be either a fighter or a magic-user on a per adventure basis
>so race as class, as we know it in B/X, was an invention of Moldvay, though the idea of a fighting mage was invented by Holmes, and it's what we got as the race as class elf in B/X