I always use 3 times exit to inlet but twice really should be OK. This engine has run very hot as the inside of the crankcase is completely coated with varnish. The crank ring had seized to the crank and lightly scored the crankcase. I don't think it ran that way, just from being turned over by hand. I think that will be OK. The back plate and disc valve were scored. Both were salvageable and will be reused. Refinement of the cooling system will take care of the heat issue.
Currently all the parts are soaking in the crockpot overnight.
Ken