Pic of the board/boards?
And can I suggest, once you find the ideal height for the air dam, you can add a belly pan going from lower edge of air dam to as far back under the engine/front suspension as you can make it reach.
I'll suggest 2.x mm. thick lauan plywood. In my area its about $7 for a 4x8 foot sheet. I used 5.x mm. thick for my belly pan, cost is about double that of the thinner stuff which I haven't tried yet.
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Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.
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