Holley Flooding Engine and Spewing Gas

What kit did you use? Most kits come with ALL of the different metering block gaskets. It's EASY to use the incorrect one. That's why I always try my best to get the old gaskets off in one piece and match the new ones up with the old ones. There is one metering block gasket that blocks off a hole or two but the rest line up perfectly. I bet that's what you did. I've done it myself......multiple times.