I was having a similar problem with a vacuum secondary holley that did not have a metering block. Instead it had a metering plate. It was (I think) a 4160. When I was tightening the 5/16 bolts to put it together I was overtightening and warped the metering plate. I replaced it with a metering block from Summit, end of problem. Good luck.
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65 convertible, bench seat, '66 289 Hi Po motor, 351 heads, headers, duals, shelby intake, petronix,
4 speed top loader, 389 rear, road demon
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