Picco's are fine engines, and powerfull. I have had all of the models you have pictured, plus some .40's. I still have the Picco P-80 fan engine fitted with an RPM rod (no longer in production..) I just recently sold (2) NIB FISE Picco .60 and FISE Picco .80, all with Picco headers and Picco tuned pipes. One of the .60's had an HB carb, the other .60 and the .80 had slide carbs.

Do a search for Picco in the pattern Forum..seems like a couple of guys have put the .80 in a pattern plane to give it a little more power now that the 10cc rule no longer matters.