If all 4 plugs are that badly fouled with oil I would expect you to be seeing lots of blue smoke out of the exhaust.
The cam cover gasket is a favourite for leaking on K-series and leaking oil onto the plugs from above, which then leads to HT issues when it reaches the plug/lead connection.
If I were you I'd take the car for a short run (but long enough to get it properly hot), watch for exhaust smoke, and then pull the new set of plugs and see what they look like.
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