Disconnect the glow relay, and the shutoff valve on the pump, and crank away.
Not sure about NGK, but I'd go for self regulating plugs like the Bosch Duraterm.
The diesel is oil in the cyls, and you won't get it all out, so job done.
Those VC gaskets are reusable, but you nave to be sure the shouldered studs in the head are fully seated, or it will leak. they like to back out some wile you remove the nut.
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