Hi Chuck
I seem to remember a write up in 'Model Engineer' about Anzani engines, but a long time ago, maybe mid '70's.
There were illustrations, but not as I recall, working drawings.
Do you mean 'Radial' or the other configuration which always struck me as somewhat ungainly?
Anzani made a fan engine circa 1909, with cylinders at 10 - 12 - 2 o'clock-ish, I saw a model of this in a Steam Rally in UK some years back. I think it was a working engine, but not in action when I was there.
You could try looking in one of the Index Sites for M. E.
Interesting Marque -- did all sorts of engines for bikes, boats, aircraft etc.
With varying degrees of success and lack thereof.
Bluechip