The spec sheet he included said 4 blade Hartzells.

Interesting point about the Baron's behavior at 300kts - at approx
50-60kts faster than the piston engined plane's cruise speed I'm
guessing trim might be a bit more critical. That alone might make the
plane twitchy, as it was never designed to go that fast.

A quick check on ASO found a bunch of C90 and E90s for the same dough,
although they wouldn't have new engines as the converted Barons and
Dukes.