I have a 292 with 57 4bbl intake and one of the New Holly 4bbl replacement carbs from CASCO and a spacer. Timing is 10 BTC. The engine is newly rebuilt and accelerates great over 55 MPH but on initial takeoff seems sluggish. I'm wondering if I have the vacuum lines connected correctly. THis is how ther are connected now: Standing in front of the car looking in the engine bay:The left fuel pump line is connected to the windshield wipers. The right fuel pump line shares a connection at the back of the intake with a future power brake hose connection (blocked). The distributor is connected to the outlet on the left side, bottom front, of carb. A smililar connection above that one is blocked off. On the left, rear bottom, of carb is another connection about 5/16 that is blocked off. On each side of the choke adjuster are two outlets connected together with a short vacuum line.
I purchased the carb (looked new) from another y-block owner and it had gas in it so I know he tried to use but I did not get a clear answer as to why he was selling it and the intake. I have looked for vacuum leaks and don't believe I have any. Any help or suggestions will be greatly appreciated. Thanks, Gary