Edelbrock 1406 whistling

I will look tommorow to see if I have a plate. I found a picture of a performer intake and this is your problem for sure. Go on holleys web sight and look at the carb adapters. There are two the 4bbl is what you would need that you can still buy if you were putinga spread bore on a square bore , but you are going the otherway. I think a solid square bore 4150 base spacer would also work and cheaper also not as high. Holley no longer lists the one I was talking about for the strip dominator. I have a bunch of spacers and plates in the shop I will look tommorrow and let you know. If I have whatyou need you will only pay me the cost to ship. I live in Pa. 18038. I'll take some pics and fit them to some intakes here if interested. and post them tommorrow if that wil help. Steve