would you trust this engine that has only 275 hours on it??? It's a 1969 was stored for 20 yrs, and has only been flown 35 hrs. since 1975. Listed in trade-a-plane. Jim
I would pull a cylinder and check the cam for rust or pitting that will also give you a good idea what the other cylinder look like .
I agree you'd want to look at the interanals for any type of rust. Never know what a crank or other parts might look like after that amount of time.