I have an old ASP .61 two stroke that I brought second hand with a plane, and in fairness, the thing runs like a charm - despite it's apparent age and way it's been treated (it's missing half of one of the heads cooling fins).
I'd have no issues sticking it inside something like the H9 60 Pulse (to which I considered before buying their Blue Nose P51 - which will run a DLE20 re running costs, extra power for a heavy warbird and flight times that I get with the 20cc gasser), as it's really been a great motor