I know. I was very judicious and careful with it. I think that Dan and Jared identified the first big problem. Somehow, the brake booster is leaking and the vacuum source for it was tapped into the runner for no. 7. By locking that off,the engine now idles smoothly and quietly. The problem comes when the carb come off the idle circuit. The missing intensifies and the engine doesn't pull smoothly and strongly on a hard pull. The plugs are snow white. Dan said the carb had been rejetted, so I'd bet my favorite ball cap that it is too lean on the main circuit. I'm no expert in jetting 4 barrels but I've done a multitude of Webers and Solexes and I'm sure I could fix it with jet changes.....if I read up on AFB's.