The turbo version was an aftermarket add-on (STC) and was re-designated R-755-S....there are more around than you might think...and we all know each other...well almost! You can tell a turbo by the exhaust high on the right side of the airplane with the normally aspirated engine having it's exhaust exit on the bottom left...but back to the point the Jacobs L4MB or dash 9 of 245 HP used on the Bobcat was also used on the first 195s
and yes Marge Sky King did fly a Bamboo Bomber that he personally owned early in the series and switched to a Cessna 310...so there were actually two “Songbirds”.....:o)