43 FARMALL H ?? MAGNETO PROBLEMS ?? HELP.

After reading 1173 tidbits from the tractor discussion archives, I was able to get a clearer understanding of what is supposed to happen. I was able to do a bench test with the magneto.
Thus the main coil was replaced - weak spark / some of the insulation off of the old coil must have heated and dripped onto the magnets below.
I cleaned the rust and debris from the impulse coupling then lubricated it. Reinstalled magneto to the proper timing.
My kill switch was erratic. Replaced it. I still only had spark to a couple of cylinders.
At this time I was only using a timing light to determine if I had spark.
I used my super human brain to figure this one out. I used a 1/4-20 bolt as the spark plug I held it with pliers about 1/4 in. from the block while cranking motor - clearly I had good spark to all cylinders.
Thats when I realized that the spark plugs that were sold to me as part of the tune up kit were Champion d15y. I changed to Champion D21y (2 levels hotter) now I have good spark. She's running great. I can almost start her with the hand crank. My next challenge will be to rebuild the carburator - I see it leaks some gas from gasketed areas.

Any takers for words of wisdom in this department?

Thanks again.
BBB