The 216 is pretty low compression so the 95 should be fine, in fact 85 is fine if you can get it. I know that the US has differant octane standards than europe, our typical lowest is 87 (RON+MON/2) at lower elevations and 85 in high elevation places like Colorado. You might consider a lead additive to protect the valve seats if you can't find leaded gasoline. You can run a little more timing advance for better economy if you can't get low octane gasoline.
