I'll try a phenolic spacer. It amazes me Edelbrock sells as many of these pieces of garbage as they do. I find it ridiculous that you have to jump through so many hoops to get one of these things to run right. I never had this problem with an original old AFB or AVS!
1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)