There is a factory original output flange that accepts the 930 sized CV joints. I "think" it was for an early 70's 911 application?? These may be hard to find though, you'll have to do some poking around on the Porsche boards.
FWIW: That 930 CV is Massive - V8 size hardware! IIRC it's about a pound (each) heaver than the T1 CV. You'll never break it that's for sure!
Alternately, you can have Todd Francis at Precision Alloy mate your output stub axles to his chromoly 930 flanges.
http://www.precisionalloy.com
He did a set for me (but for T2 flanges). Super nice work.
Jeff