You don't need a new dampener or chain, but now you've got timing cover clearance issues. You might or might not need a inside of the timing cover machined so it doesn't rub. Secondly, you'll have to disable the balance shaft. This means reduced engine life and increase vibration.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne