Hows the compression? Valve adjustment? Spark Plugs? Points/Condenser? Do you have an anti-surge spring on the throttle rod just ahead of the carbuaror?
Start by taking the compression, and if you can, pressurize the cylinders to check the condition of the valves. Then check out the spark; should be a nice crisp blue.
Then check out the fuel; start at the sediment bowl (make sure the screen is clean and fuel flows nicely), blow out the fuel line and the nipple on the carb. You should take off the carb and clean it out using brake cleaner, compessed air, and fine wires. Adjust the float and make sure both ears are level and they are not in contact with the sides of the carb bowl. Todays gas is not too kind to the old carbs when it sets there for a few months.
Finally, check out the gap between the govenor rod and carb rod (just behind the fan on the left side). Disconnect at the joint, move the trottle lever to the wide open position, pull the throttle shaft from the carb to the wide open postion. You should have 1/16-1/8 gap between the two. Bend the govenor rod as necessary to obtain this gap.
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