Thanks Jan, thats great info and a good starting point. I helped my friend with the re-maiden of this plane on the 61 thats in it. I tuned it and it ran great but just not enough power. Im looking forward to trying this Rossi out after I rebuild it with fresh gaskets and o-rings.
I do remember my Dad running this engine many many years ago and it was one pissed off unit! Luckily its been in a box untouched and still turns however I'm going to take it apart very carefully and save what I can as templates just in case.

Anyone have any leads on new old stock parts?