Having rebuilt two '73's, a '76 and an '86, I will say enjoy your project; I certainly had fun doing mine. I still own and shoot all but one '73, which somebody with money talked me out of, and it is a really good feeling to use a rifle you have put your own time and effort into. I relined two,(plus an 1889 Marlin in .38WCF) ,and rebarrelled one and have found them all to be good shooters. I guess the hunt for parts is part of the fun.
Regards,
Jubal Starbuck