1973 dodge dart sport driveshaft length ?

what is the correct length, center to center of the u-joints, for a 1973 dodge dart sport driveshaft with the 340/4 speed/ 8 1/4" rear combo ?
i tried looking this up on the google, but i am unsure of the results.
thank you in advance for helping this old dumnutz out !

Depends on the build date.

I believe it is 51.89" C-C...

thank you !