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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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