My first performance rebuild in my high school hot rod was a 327. At first it had 882 smogger heads and a hydraulic cam. The engine smoked really bad and fouled plugs with a hard black buildup. I figured the rings didn't seat so I took it all apart, put new rings in it with the proper hone(did it myself so I am positive) and reassembled with some shaved and ported 461's and a solid stick. It still smokes. I have tried many different valve guide seals, and Valve cover baffles, Tried different carbs and pcv valves, but I have always used the same Stealth intake manifold and I use Sealed Power gaskets. Do any of you have any ideas why I might be fouling so bad?

If your using molly ring's a hone job is difficult to get them to seat without using the right finish on the cyclynder walls.

Since you are using the same intake on both combos I think you could be sucking oil from the lifter valley.Pull the pcv valve off and plug it pull the breather off the other side and get someone to hold a towel over the hole,go to the hole on the other valve cover and take a piece of paper and lay across the hole.Usually if there is a lifter valley leak it will pull the paper to the hole because it has an internal vacuum leak.

Plugs fouling from being black can also be from an excessively rich carburetor. Are they black and wet from gas or black and oily? If you are using a Holley it could have a blown power valve.

I have checked and changed PV, it's currently set at 3 LB below my idle in gear vacum. The plugs are not gas fouled as far as I can tell. They don't foul until they become so crusty that the buildup actually bridges the gap. The engine smokes a little blue at lower RPM's when I gap on it, and a bit more as I rev it towards 4500-7500.