67 383 spark plugs/what ta use?

roccodart440 said

Run the plug that would come stock in that engine but for ease of availability and quality I'd switch to NGK.

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There's a better reason than that. Most spark plug have a "range" of resistance listed in the catalog. All the NGK plugs have a very specific number. I was looking for plugs for this 396 I have just built. The AC Delco plugs which were OE for that engine list a resistance range from between 5000-12000 OHMS. The NGK lists theirs as 6000.

SO I started looking and every NGK number has a specific resistance rating instead of a range.