the 302 ho in the mustang has a 50oz imbalance 28oz is for the older 302 and it sounds as though your pressure plate isn't releasing evenly causing it to shutter when you put in a new clutch disk it is always wise to also install a new pressure plate suited for that disk.
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Rice Haters Club member #68
'93 Cobra 10.20@135
'89 Gt Coupe 12.20@115
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