I paid more for this product because I expected it to be done right. My fault, it's crooked. The carburetor gasket should be flat, but it's about .022 from corner to corner. It doesn't seem too bad, but when I tighten the carb the shims don't fill the gap without deforming the throttle body. Edelbrock tech support can't help as I've been waiting for over an hour. I'm still waiting. Ribbed for an easy piece to the point where I have to smooth it out myself.