Add your abody driveshaft length for quick reference

I currently have a '68 Dart with a 904 and 7 1/4. I'm going to possibly swap in a 489 cased 8 3/4 soon. Can my driveshaft be modified to fit? I'd assume I'd have to have a shop cut it, balance it, and install a new yoke. I have a pdf with all different driveshaft lengths but I didn't catch anything for a 904/8.75 in a 111in wheel base car. Anyone have this setup?