power valve

Are you sure you have a dead cylinder and it wasn't just the carburetor fouling the plug on that cylinder from being extremely rich? My quick fuel right out of the box foued 3 plugs on my engine, I live in Idaho, 4000 feet above sea level and I had to lean my carburetor down quite a bit.
I'd get a new set of plugs and get some larger idle air bleeds and some smaller idle feed restrictors installed into the carburetor and see if it will run without fouling plugs then. I would also put your vaccum advance on a manifold vaccum source on the carburetor to give you more timing at idle to burn the mixture , that will help keep the plugs a lot cleaner too. That stroker of yours will like a lot of timimg at idle, probly 28-30 degrees.