Edelbrock AVS2 650. Tearing everything apart next week. Checking valve assembly, head gaskets, heads, cylinders, etc. Only real way to see what's going on at this point. What has be scratching my head is that after the compression test, coolant pressure test and cleaning and spacing the spark plugs, it fired right up and idled like a champ after several startups. However, as soon as I put it in gear the RPM's dropped substantially, carb popped and died. This happened every single time putting it in gear.