Dial in some negative camber in the front and rear,this can be done at the front by spacing out the lower A arm. Start with 1/8" and see how the tires sit. Another cheap fix is to remove the choke shaft and butterfly. That reduces the restriction in the carb, but plug the holes where the shaft use to go, so it doesn't draw air and lean out the mixture. Spend $ on tires, light wheels (not wires, they are heavy and can go out of tune) and school. Headers and less restrictive exhaust help too. Next, move the battery to the right side of the rear boot to put some weight over the wheel with the least weight to improve the balance. Do you have a radiator fan driven by the fan belt? That takes HP to drive. Consider switching to an electric one, but use a thermal switch. Check your plugs and learn how to read them. You might want to go to a hotter plug, especially in the #2 and 3 cylinders. Don't hog out the intake ports too much,you lose intake air volicity at lower rpms which reduces torque (coming out of turns). I found that a 3 stone brake cylinder hone works pretty well to open the ports. When you have the valves ground, see if the machine shop will bevel the valve guides round to reduce obstruction in the area. Wash the head with soap and water thoroughly before reassembly. Before you fire it up, turn it over awhile with the spark plugs removed and gas disconnected to get teh oil flowing.
Finally, don't forget to make offerings to whatever higher power you perfer!