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most likely the 383 is externaly balanced. some after market companies sell internaly balanced cranks but they are expensive. you will need a externaly balanced flywheel. you can also check with a local machine/speed shop and see if they can find you a "balance plate". this bolts up with the stock 350 flywheel for use on external motors. it`s cheaper than buying a new flywheel but probably not as good as a external flywheel. my buddy had a plate on his 406 with no problems but you never know.
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Anthony
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