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I have found that there are 2 types of O-ring. One is shaped - not quite oval, but definitely flattened - and one is round, like a traditional O-ring.
All but one of the gasket kits I've gotten over the years came with the round O-ring. I used one for a while. It made installing and removing the distributor incredibly difficult - I suspect the volume of the groove was just insufficient to hold the volume of the compressed O-ring.
At some point I got fed up and put the ancient shaped, oval O-ring (thankfully I keep a selection of used gaskets & seals) back in, and since I have been using that one I've had zero issues.
I have also since then gotten one of the oval o-rings in a gasket kit, so they do exist as a new part.
I expect that the oval version is correct, and the round version should not be used. At least on my 88.
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'88 Coupe Lagoon Green
"D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen"
"We must not allow a Mineshaft Gap!"
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