Rip the head off it and plane 70 thou off it. You can get a good gain from lifting the compression ratio. If you want to get real clever take 70 thou off one side of the head (plane it on an angle) This changes the flow from the inlet valves into the combustion chamber and you will get some more gain. Advance the cam by 7 deg also. You will have to re jet the carb but. chuck some dellortos or webbers on it. Simple mods to an A12 to get a good gain.