727rebuild/ front pump questions

Unless you need the 71 date code, I would just swap the whole thing. If you need the date code, you could swap the inerds. Need to be careful about mixing early and late pieces when it comes to input, front drum, and pump/reaction shaft.
No, date code doesnt matter. Going back into my d150. At my shop today,i started looking at everything really well, and i think if i use the input shaft,pump, hi/reverse clutch, and direct clutch pack it will work. Ill reuse everything original from output shaft back( shaft, original planetary's etc. Will that work? Tranny was run hard and put up wet for nearly 25years, cant fault it