Steve,
I just went through virtually identical process with the front prop on my 336. Only 140 SMOH, but sat a while and could not be OH'd. My IA felt AC 23-27 provided authority to change the prop and the local FSDO agreed with him. The -C61, -C302, and -C307 are are all on the C337 TCDS A6CE and all these props share the same prop TCDS P5EA. YMMV.
David
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336
N1725Z
Beavercreek, Ohio
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