Help on drive shaft length

I just ordered my Dana 60 from Cass at Dr. Diff (good guy alert, he worked with me on the phone to figure out exactly what I need, spent about an hour doing it with Web page/shopping cart difficulties) and will be swapping the Diff, brakes, brake lines and my new 727, torque converter, kickdown, ministarter and dip stick.

Once the trans and Diff are in, I will measure for drive shaft length. I have read the thread where people have posted their drive shaft lengths for trans and diff. I have noticed that drive shaft length has varied by as much as half an inch in identical setups on same year fastbacks.

A brand new 3" diameter drive shaft is in the neighborhood of $450-$550 from what I remember. I will be ordering that from Cass as well because he has good customer service.