I had the heads rebuilt on my LTD with 335/400 engine. I put them on following (what I thought) was the correct procedures) and when I started it up, white billowing smoke out the exh. I also have visible hole/port above the intake deck on both sides about half way down. It appears to be a water port but with nothing leaking. Did I put the heads on wrong? Plugs on the left are slanting back and on the right slanting forwrd. HELP>>>>

Jim in CS