68 manual steering box question?

[jasonL78]

Ok guy's just wondering if GM had a couple different manual steering boxes. I was rebuilding my original 68 L78 manual steering box last night and it has a cast cover on it. I had another manual box out of a 68 nova also that has an aluminum cover on it. The only difference I know of is mine was a big block car and the other one was a smalll block car. Without taking the small block one apart. Just curious and was wondering what the difference was. Did the BB cars get a different steering box?

Jason