As you probably realize, this is one of those 'controversial' subjects on this board.
I have had excellent results with Bosch +4s on a wide variety of vehicles.
As a bonus, they do not need to be gapped, nor do they lose their gap over time.
They also seem to stay cleaner than standard plugs, even on known 'oil burners'.
1986 300E 5-Speed 240k mi.