There should be 6 shims and you must use that number. Adding them between the pulley halves widens them and thus losens the belt. Less shims between the pulley halves tightens the belt. The ones you don't use between the pulley go on the outside. Be sure and check tension after your first fire it it up, after the first drive and then again in about 50 miles.
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John
89 3.2 Targa 123k miles
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