I have a 350 in my 75 K5 with a Edelbrock Performer 1406 (600 cfm/electric choke.) I have a dual plane spread bore Weind intake manifold. There is a spacer with four holes between the carb and manifold. Couple questions: 1. Why is the spacer there? What purpose does it serve? 2. Is it a benefit or simply a restriction? I am mid carb rebuild and wondering if I should stick the spacer back on or if it does more harm then good. Any info. would be helpful as I am hoping to take it out for the first time tomorrow. Thanks.