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Any cam will work with the 92-94 opti setup. All aftermarket pins come with a long dowel pin - just cut it to length (around .300" for un-vented). This is commonplace.
If you feel the need to spend $500 on the conversion parts alone, go ahead. But many people have been converting the 92-94 optisparks to the vented setup by just installing the MSD cap and rotor. There is also a tech article floating around where a few folks have installed vacuum fittings on the stock un-vented opti and converted them without even removing the cap/rotor and just added the vacuum lines. Both of these options are much cheaper alternatives if you are satisfied with the stock-type chain (which is plenty strong enough for a cam-only setup).
If you do opt to go with a double roller, you'll also need to convert to an electric water pump, as the double roller chain does not have the "double gear" to drive the pump.
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