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Sure, thank you.

a) = front of carb pad and b) = rear of carb pad.

The measurements came off the manufacturer's web sites but it was 2 years ago and was just reading off my notes.

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Do you know where they measured the carb pad to? Top of the block I take it?

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Yes. From Edelbrock's site, they take a straight edge and lay it along the carb pad front to back. Then they stand a ruler from the bottom of the front of the manifold and see where it meets the bottom of the straight edge, thats "a". ...well here's the picture