Wouldn't a vacuum gauge prove or disprove a leak? If you can eliminate that possibility and you've swapped carbs with the same result, I'd rule out carburetor problems. Anyway it sounds like we're all throwing darts so I'll throw a couple. First, yes you can check the timing with a light, you just need a 12 volt source to power the light. You may not learn much because the advance is beyond any marks anywhere. What you can learn is if the spark is occurring at the same time every time or if it's erratic. I've had similar problems with different machines and the solutions were all different. My 140 Farmall taught me to adjust valves one cylinder at a time. For some reason getting it on TDC and doing the valves that the IT manual says you can do, didn't work well for me. Since then, one cylinder at a time. If you could borrow a distributor from another tractor and wire that up, you could potentially eliminate spark and timing from the list of possible problems. You may have cracked cylinder head allowing one cylinders exhaust to interfere with the adjoining cylinder's intake. As mentioned before, an internal crack in the manifold will do the same thing.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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