To swap from non-vented to vented opti you'll need:
1) 95+ vented opti.
2) 94+ Bbody or 95+ Fbody timing cover.
3) 95+ camshaft
4) 95+ timing chain and gear set.
5) 95+ opti vacuum harness.
6) 95+ opti electrical harness.
I think that about covers it.
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John
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