Would this 727 fit in my 1973 Duster?

Yes, if given a choice, get a spline out put. I got a running 73' 440-3 and trans. for $100. So...
http://www.actionmachineinc.com/multipiecedriveshaftguide.aspx
Also, if anyone has both style 727's, what's the weight differance ? Always wondered.