What's the quality of the local fuel you will be using in it? Which brand of spark plugs do you like to use? If Champions I would try a RC9YC or RN9YC and if that looks like it is to hot try a RN6YC or a RC6YC. If you like Autolites try a AR3911 or the colder AR3910
BTW, is that compression ratio actual measured or maybe correct
If it is the actual ratio those plugs should be in the ball park
If it is lower than that then you might want to use a hotter plug
It is a lot safer to use a colder plug when in doubt so be safe