I have 2 1971 Fast ratio steering boxes I located while moving parts to my garage today. I forgot to look at the code on the BB one,but I have the SB one and the lid has 044 1 on it. I know both are fast ratio as I have documentation for it. Can't locate Duane's book in the attic area due to overstuffed conditions.What does it date to? Also, I have the master cylinders with the dual bleeders. Is it practical to have them rebuilt? or allot of wasted money for a driver car?