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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