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Spark Plugs and Gap for 91 Merc 260

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I have a 1991 Mercruiser Bluewater Ski with serial number D624197. From what I can tell, the NGK BR6FS is the correct plug. I'm seeing different gap recommendations though of 0.035 or 0.040. Can anyone help?


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My 1990 Merc B.W.S. Ser #OD379792 takes AC Delco AC-MR43T with a gap of .016, Timing at 8 deg. BTDC, dwell at 27-31 deg.,

Right from the original engine carb cover.

Thanks! The MR43T matches the NGKs I listed. From another thread I read, .016 is points gap correct?

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