Timing WD Magneto

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   So I am getting a backfire through the carb while running the tractor at any speed.I did the initial timing setup but I feel it it off causing running issues, it also cranks forever before starting and is very difficult to keep running. I have fully cleaned the carb twice. Adjusted valve lash to 15 thou cold and then warm. The manifold is in awful shape but I would prefer if that was last to fix as its not cheap. I have new plug wires ready to order as the magneto someone put on looks to be from a Caterpillar, yellow paint and a metal 90 degree cap cover deal.
I set initial timing with the mark on the bottom through the viewing plate. The mag is basically in the center of its adjustment. What rotation does what? I have a timing light and all, do I really have to climb under the tractor to read timing while it's running.... Feels real unsafe so I want to vet how first.

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