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The microfiche shows that you have a 21 top 43 bottom gears I would check to make sure this is right. Then I would drop a tooth on top and see how that works. You may loose a little top speed, but i'm not sure what you are looking for. If you don't care about top speed you could drop two teeth on top or go to a 44 tooth bottom gear. Try to find some one with used gears so that you can experiment with it and find what you are looking for.
 

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You should check the gearing that you have now but if the microfiche is correct I would think a 19 tooth top gear would be a good start. According to my calcutations with a 156" track and 19 tooth top and 43 tooth bottom gears you should still have a theoretical max speed of @83 - 88 mph. For the time you want to go fast.
 
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