[franken]

If you just want to make sure it runs, and not for long I'd simplify things. First, a 10 year old battery is no good. Buy a few spray cans of B12 from the parts store.

Block the wheels and put the trans in neutral.
Pull the plugs and shoot some oil in the cylinders.
Check the oil.
Change the oil if desired.
Verify the engine can be turned by hand. Grab the fan and turn it in the direction that would make the fan draw air through the radiator. If a fan blade pointing up looks sort of like this \ turn the engine to your right while leaning over the radiator. Turn it at least 2 full 360* rotations.
Verify the throttle on the carb works freely.
Crank the engine w/ the plugs out
Put the plugs back in and attach the wires correctly.
Crack the throttle and shoot some B12 in it. Not much just a few seconds.
Crank it.
It should fire a bit if there's spark.
If it doesn't fire check spark. I'd probably take the cap off and run a few thicknesses of paper between the point contacts.

You can run the engine by having someone fire it and misting B12 into the carb with the throttle blade open a bit. Or you can rebuild the carb, flush the tank and lines, replace the filter and so on.