Tweedy its on the bench put the glow head back on run glow with the prop Fox suggest, this will give you a base line, I doubt that you have had any big ether loss from those cans. If your engine still has issues on glow return it to Fox they are great on service, its not the Davis head with the issue martin

I would give Bob Davis a ring first though

a slight odor of ether is normal in the packaging material, do you have an other diesel you can run the fuel in

Also with the Fox on the bench holding the prop and slowly turning does it hold compression

are you sure there is not 2 head gaskets on the engine