Just bought some Evans waterless coolant from these guys
http://www.evanscoolants.com/evans_waterless_engine_coolants.html
Its expensive but reading the feedback and watching a few videos it seems like its good stuff. And as the engine is a rebuild and hasn’t been filled up with water yet its idea as i don’t need to flush it.
So im getting ready for the end of april as that’s the planned time to get her ready to try a start up 🙂