Thanks for the comments -
I've changed a number of things since that Dellorto run, and the Dellortos may just have the edge now, but on a pure performance basis, it hasn't been worth the change.
On the other hand, the Dellortos look and sound fantastic, and its been fun learning how they work.
changes since then:
1) Pmac/Skiddell air box & cold air induction
2) modified mechanical advance on distributor to run higher static advance with 35 degree max.
3) finally (this week) invested in bigger idle jets. ******. wish I'd done that 2 yrs ago!