Holley metering blocks and emulsion

Came across something I’ve never seen before and I’ve done more than a handful of these. I’m going through and building a carb for a friends stroker small block ford mustang street car. He provided the carb. Where it originally came from is unknown but it’s a complete Holley list 80570. The primary metering block has ZERO emulsion holes drilled. Block is numbered 6104-3. I have never come across this at all. Anyone else?
@Mattax
@Newbomb Turk






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