wrong clutch fork?

Interesting, I just went 383 from 340. The fork from the SB is too short. Brewers says it's the same piece BB or SB. As I see it I need the 12 1/2 to line up with the Z bar.

According to Brewers the BB and SB E-body fork is the same at 10.5" long. The A-body SB is 12.5" long and the BB is 10.875" long.