Working on daughters 350, snapped a spark plug in two, under a header of course so I'll blame that lol! Bought an Edelbrock kit for her Holley, somehow works for an 80457 4 barrel Holley cause the float gaskets tear when you loosen them, even the right way. Plugs are pretty sooty, going to pull and clean the rest of them, pull dist cap and see what's going on in there.