1970 A833 output shaft length

You are in too much of a hurry. The driveshaft length is plus or minus so much, you could very well end up doing it twice and still missing the Cruise
But I found

66fs said

What dimension do you need? Factory c to c is 48.6 inches for a 68 Barracuda with manual transmission.

Click to expand...

looks correct.
Good luck