First plug change.

beanhead said

Thanks. Leave the IFR as-is? I think they're set at .035 but I may not be remembering that right.

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That 8.5 power valve is a bit high I would think. I would think you'd need one 3.5-4.5. How much vacuum is your engine producing? I'd recommend the AR3911 Autolite spark plugs depending on which cylinder heads you're using.