It's March '09 and I just realized that you posted a message to me. I've never used or even seen this Profile Comments area, so I apologize for the delay in responding. Catatude has the original Perkins M30s with Hurth HBW 50 gearboxes. (One was replaced with the ZF equivalent - ZF-5M). The props are 15X10, and I think the they are a bit over-pitched. If I were to do it again, I'd get 15X9s. She does about 6 knts. @ 2200 RPM on one engine; 7 kts on two. She'll do about 7.5 -8 @ 2500 rpm (depending on conditions, of course) and that's about as hard as we ever push.
By now I'm sure you have your set-up complete - I'd be interested in hearing what you did and how it's working out.