if you haven't seen damage yet (like parts flying) i'd say you didn't damage your 300 at all. those old gassers are low enough on the compression that the ether won't pop till the spark plug fires (which at cranking speed should be fully retarded), so it won't preignite.
you NEVER want to use ether on hot glow plugs.
the danger with ether in a diesel is that it will ignite much too early in the compression stroke (when normally there would be no fuel present) and cause damage.
my experience for the past 20 years or so is that in a direct injection engine, in small quantities (like 1/4 second shot), when the engine is getting tired, ether doesn't seem to cause any harm. not to say it can't!! but that it doesn't always.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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