I haven't been through all the other threads in their entirety, but I have an idea that may help. It's really cheap, too. I was thinking perhaps if the engine is cranking harder with the choke out, and has very little power, it may be as simple as you having a clogged air filter. I had one come through the ranks that when I picked it up, it would run but always sound like it was fighting itself to stay running, and engaging the deck would almost kill the engine. I pulled the air cleaner cover, and sure enough, packed solid with who knows how many years of crud. It's easy to check and cheap to replace, and should save you some headaches. If someone has already mentioned this in the other threads, then my apologies, and best of luck getting it sorted! If you feel overwhelmed, getting help is never a bad thing.
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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