Spark plugs

My engine is a Ford Racing 347 crate engine, I can't find a recomended plug fitment for the engine on the Ford Racing site.

There is not much I can find in the forums so I pose the question..
What brand have you used I have NGK installed.
What heat range for road and trackday use, I've seen NGK #5,#6,#7 suggested.
Plug gap recomendations I have seen 28 thou up to 50 thou and more.
NGK have an Iridium type at great cost, do they work any better for the extra cost.

What would you suggest?

Make- heat range- gap- ones to avoid

Steve
 
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