4 speed trans id and other info needed

The main case is from a 1969 Los Angeles built car, the original transmission was assembled on June 16, 1969. It looks like some one has been in to it. The input retainer looks like a 1975 or newer and is most likely case C-13157. I don't see any bolts holding it on and I am guessing the bolt pattern is the wrong one for the case. The side cover looks like a 1970 or newer with the scissors style detent and steel forks. The tail looks like the 68-75 for the 30 spline main shaft. The first year for the overdrive was 1975 and would have been cast iron. In 1976 they used the aluminum cases in the A31 optioned Dart Lite and feather Duster. I belive the 1977 and newer cars all used the aluminum cases and trucks and vans used the cast iron case.