Holley Tuning Question

A metering block conversion WILL NOT WORK ON A 3 BARREL HOLLEY! If it is a 1050 it will have dump tubes in the secondaries a 950 have dog leg boosters, ether way holley moved the tubes and boosters inboard about a 1/4 inch on both sides and they moved the air bleeds too. There is a special plate and gasket for them too( hard too find ) and the secondary diaphragm is like the ones on 6packs but the metal stem is about a 1/2 inch longer. I made my own with epoxy and a dremel tool.