I went through the mag side carb with an extremely fine toothed comb...I thought I found the issue immediately looking at he float adjustment. One side was bent up higher than the other. Everything else looked great. But it STILL will not fire on the mag side. I have compression, fuel, spark, and timing. The only thing left is AIR. The mag side pipe happens to be the one that I repaired and had a mouse nest. I spent quite a bit of time cleaning the nest out before welding and blasting. I would bet my left spark plug that I got it all out. My theory is when they sand blasted the pipes, they used a rag to plug the holes and keep sand out of the pipe. I'd be willing to bet that one of those rags are still in there...