I'm not sure it's the exact article you had in mind, but I have a reprint of an April '70 article testing/comparing 70 GTOs. One is a 455 Auto-trans A/C car and is equipped with hood ram air. The other is a fairly well optioned ( but no A/C ) RamAir 3 4-speed car.
Due to traction/launching issues the 2 cars were not that different in ET: 14.6 vs 14.76 in favor of the 400 RA3. The 455 car's trap speed was just a few hairs under 96, the 400's car just a thin hair under 100. Some was weight related, but I doubt 4 miles an hour's worth.
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