A-Body A833 w/Hurst Shifter and SBM Bell

Whats wrong with the alumninum bell housing ? Just curious becuase i figured they are more pricey than cast iron ?
nothing wrong with the aluminum ones... and as far as I know there's nothing "better" with the cast iron one in regards to performance or safety. The cast iron one is just rare, as it was only produced in 1968.