A friend of mine was thinking of doing a turbine conversion for the
337. Would make one helluva light twin! I've got a few hundred hours in
the 337 and even some time in a 336 back in the mid-late 60's. It kind
of reminded me of a C-182 with higher fuel consumption.
Back then, a multi engine rating was sufficient for centerline thrust
aircraft. It was some kind of marketing thrust to get more people to
fly twin engine aircraft without the necessary skills to operate an
airplane more complex than Dufus was used to flying.
The 337 was plagued with expensive hydraulic pac problems for the gear.
Now it seems to be an antique or oddity.