Seaplane down off Miami Beach....

Curious you would introduce "run a whole lot smoother" and "power pulses"
then, if you thought those issues weren't relevant. Very odd. Even
stranger that those issues were the sum total of your rebuttal to his
post

Ya got me there Pete... nothing escapes your eagle-eyed gaze, eh?

Not really sure where I was going with that. On reflection, Otis' post
would suggest the higher power turbine conversion might have have an
adverse effect on the old Mallard airframe, even though as you
mentioned the STC should include reinforcing mounts, spars etc. to
allow for the increased stress on the airframe. If anything, I'd guess
the smoother running turbines should stress the airframe less than the
throbbing & vibrating radials in spite of their higher power.

(Disclaimer: I'm not an engineer, just an aero turbine analyst)