First thing you will want to do, pull the plugs and give each cylinder a teaspoon or so of oil. Let it be soaking the rings before you try to start it. Crank the engine through a few times to blow the excess oil out. Make sure it has compression on all the cylinders. A simple "finger over the spark plug hole" will tell if it has stuck valves.
How is the fuel? Was it stored with gas in the tank? If it was, the tank will need to be taken off, rinsed out with some E85 gas. Unless the carb was drained, it will also need attention. Don't be afraid of it, they are simple and field serviceable.
The magneto is a stand alone system, it has no connection to the battery, and don't connect it to the electrical system! If there is a wire connected to it, that is a kill wire, you ground the wire to stop the engine. After sitting that long real good chance the points will need cleaning to get spark. Be sure to check the spark at the plugs before cranking on it too long.
As for connecting 12 volts to the starter, yes you can safely do that. Just be careful to limit cranking time, and avoid starting it any more times than you have to. When operating a 6v starter on 12v, it tends to slam the drive into the flywheel. Some handle it well, others don't, just depends on the design of the starter.
Are you positive the generator bracket is welded? Welding to cast iron is not a good practice. Chances are if it is only welded, it will eventually break off. The alternator needs a solid, square, well aligned mount in order to be reliable and not throw or eat belts. You may want to cut the weld with a grinder, find a good way to mount a solid, well fitting bracket.
Once you get it running, try to keep it running as it is long enough to drive it around a bit, put it through the motions. Make a list of everything you find that needs attention before you start working on it. What you don't want is to have to take it apart 2 or 3 times because you missed a problem that could have been addressed the first time.
A shop manual will be a great investment. They are not expensive, and will pay for itself in mistakes not made!
Keep us informed, ask all the questions you want! Above all, have fun doing this!
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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